diff --git a/src/components/interests/linked-berths-list.tsx b/src/components/interests/linked-berths-list.tsx
index 538a782a..2d3d2e4d 100644
--- a/src/components/interests/linked-berths-list.tsx
+++ b/src/components/interests/linked-berths-list.tsx
@@ -16,14 +16,22 @@
  *   - "Remove" — calls `removeInterestBerth`.
  */
 
-import { useState } from 'react';
+import { useMemo, useState } from 'react';
 import Link from 'next/link';
 import { useParams } from 'next/navigation';
 import { useMutation, useQuery, useQueryClient } from '@tanstack/react-query';
-import { Anchor, Loader2, Star, Trash2 } from 'lucide-react';
+import { Anchor, Loader2, Plus, Star, Trash2 } from 'lucide-react';
 
 import { Button } from '@/components/ui/button';
 import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
+import {
+  Command,
+  CommandEmpty,
+  CommandGroup,
+  CommandInput,
+  CommandItem,
+  CommandList,
+} from '@/components/ui/command';
 import {
   Dialog,
   DialogContent,
@@ -39,7 +47,9 @@ import { Textarea } from '@/components/ui/textarea';
 import { Tooltip, TooltipContent, TooltipProvider, TooltipTrigger } from '@/components/ui/tooltip';
 import { HelpCircle } from 'lucide-react';
 import { apiFetch } from '@/lib/api/client';
+import { toastError } from '@/lib/api/toast-error';
 import { cn } from '@/lib/utils';
+import { toast } from 'sonner';
 
 // ─── Types (mirror the API GET shape — see interest-berths.service.ts) ─────
 
@@ -151,6 +161,22 @@ function useUpdateLink(interestId: string) {
   });
 }
 
+function useAddLink(interestId: string) {
+  const qc = useQueryClient();
+  return useMutation({
+    mutationFn: async (args: { berthId: string; isSpecificInterest: boolean }) =>
+      apiFetch(`/api/v1/interests/${interestId}/berths`, {
+        method: 'POST',
+        body: args,
+      }),
+    onSuccess: () => {
+      qc.invalidateQueries({ queryKey: ['interest-berths', interestId] });
+      qc.invalidateQueries({ queryKey: ['interests', interestId] });
+      qc.invalidateQueries({ queryKey: ['berth-recommendations', interestId] });
+    },
+  });
+}
+
 function useRemoveLink(interestId: string) {
   const qc = useQueryClient();
   return useMutation({
@@ -481,6 +507,134 @@ function LinkedBerthRowItem({
   );
 }
 
+// ─── Add berth dialog ───────────────────────────────────────────────────────
+
+interface BerthOption {
+  id: string;
+  mooringNumber: string;
+  area: string | null;
+  status: string;
+}
+
+interface AddBerthDialogProps {
+  open: boolean;
+  onOpenChange: (next: boolean) => void;
+  interestId: string;
+  /** IDs already linked — filtered out of the picker so the rep can't double-add. */
+  excludeIds: Set<string>;
+}
+
+function AddBerthDialog({ open, onOpenChange, interestId, excludeIds }: AddBerthDialogProps) {
+  const [selected, setSelected] = useState<BerthOption | null>(null);
+  const [markSpecific, setMarkSpecific] = useState(false);
+  const mutation = useAddLink(interestId);
+
+  const { data: options, isLoading } = useQuery<{ data: BerthOption[] }>({
+    queryKey: ['berth-options', 'add-to-interest'],
+    queryFn: () => apiFetch<{ data: BerthOption[] }>('/api/v1/berths/options'),
+    enabled: open,
+    staleTime: 60_000,
+  });
+
+  // Filter out berths already linked to the interest so the rep can't
+  // double-add. Pre-natural-sorted by the service.
+  const available = useMemo<BerthOption[]>(() => {
+    const list = options?.data ?? [];
+    return list.filter((b) => !excludeIds.has(b.id));
+  }, [options, excludeIds]);
+
+  async function handleAdd() {
+    if (!selected) return;
+    try {
+      await mutation.mutateAsync({
+        berthId: selected.id,
+        isSpecificInterest: markSpecific,
+      });
+      toast.success(`Linked berth ${selected.mooringNumber}`);
+      onOpenChange(false);
+    } catch (err) {
+      toastError(err);
+    }
+  }
+
+  return (
+    <Dialog open={open} onOpenChange={onOpenChange}>
+      <DialogContent className="max-w-md">
+        <DialogHeader>
+          <DialogTitle>Add berth to interest</DialogTitle>
+          <DialogDescription>
+            Link an existing berth. Defaults to a non-primary, non-bundle link. Edit those flags on
+            the row after it lands.
+          </DialogDescription>
+        </DialogHeader>
+        <div className="space-y-3">
+          <div className="rounded-md border">
+            <Command>
+              <CommandInput placeholder="Search by mooring number…" />
+              <CommandList>
+                {isLoading ? (
+                  <div className="p-3 text-sm text-muted-foreground">Loading berths…</div>
+                ) : (
+                  <>
+                    <CommandEmpty>No berths available.</CommandEmpty>
+                    <CommandGroup heading={`${available.length} available`}>
+                      {available.map((b) => (
+                        <CommandItem
+                          key={b.id}
+                          value={`${b.mooringNumber} ${b.area ?? ''} ${b.status}`}
+                          onSelect={() => setSelected(b)}
+                          className={cn('cursor-pointer', selected?.id === b.id ? 'bg-muted' : '')}
+                        >
+                          <span className="font-medium">{b.mooringNumber}</span>
+                          <span className="ml-2 text-xs text-muted-foreground">
+                            {formatStatus(b.status)}
+                          </span>
+                        </CommandItem>
+                      ))}
+                    </CommandGroup>
+                  </>
+                )}
+              </CommandList>
+            </Command>
+          </div>
+          {selected ? (
+            <div className="rounded-md border bg-muted/30 px-3 py-2 text-sm">
+              Selected: <span className="font-semibold">{selected.mooringNumber}</span>
+            </div>
+          ) : null}
+          <div className="flex items-center gap-2">
+            <Switch
+              id="add-berth-specific"
+              checked={markSpecific}
+              onCheckedChange={setMarkSpecific}
+            />
+            <Label htmlFor="add-berth-specific" className="text-sm">
+              Mark as Specifically pitching (shows Under Offer on the public map)
+            </Label>
+          </div>
+        </div>
+        <DialogFooter>
+          <Button
+            variant="outline"
+            onClick={() => onOpenChange(false)}
+            disabled={mutation.isPending}
+          >
+            Cancel
+          </Button>
+          <Button onClick={handleAdd} disabled={!selected || mutation.isPending}>
+            {mutation.isPending ? (
+              <Loader2 className="mr-1.5 size-3.5 animate-spin" aria-hidden />
+            ) : (
+              <Plus className="mr-1.5 size-3.5" aria-hidden />
+            )}
+            Add berth
+          </Button>
+        </DialogFooter>
+      </DialogContent>
+    </Dialog>
+  );
+}
+
 // ─── Component ──────────────────────────────────────────────────────────────
 
 export function LinkedBerthsList({ interestId }: LinkedBerthsListProps) {
@@ -493,6 +647,8 @@ export function LinkedBerthsList({ interestId }: LinkedBerthsListProps) {
   const rows = data?.data ?? [];
   const eoiStatus = data?.meta.eoiStatus ?? null;
   const isPending = updateMutation.isPending || removeMutation.isPending;
+  const [addOpen, setAddOpen] = useState(false);
+  const linkedBerthIds = useMemo(() => new Set(rows.map((r) => r.berthId)), [rows]);
 
   // Three-bucket split per the Deal-berth + Bundle model:
   //   • dealBerth: the single is_primary row — the one templates/EOI
@@ -520,11 +676,21 @@ export function LinkedBerthsList({ interestId }: LinkedBerthsListProps) {
 
   return (
     <Card>
-      <CardHeader>
+      <CardHeader className="flex flex-row items-center justify-between gap-2 space-y-0">
         <CardTitle className="flex items-center gap-2 text-base">
           <Anchor className="size-4 text-brand-600" aria-hidden />
           Linked berths{rows.length > 0 ? ` (${rows.length})` : ''}
         </CardTitle>
+        <Button
+          type="button"
+          size="sm"
+          variant="outline"
+          onClick={() => setAddOpen(true)}
+          aria-label="Add a berth to this interest"
+        >
+          <Plus className="mr-1.5 size-3.5" aria-hidden />
+          Add berth
+        </Button>
       </CardHeader>
       <CardContent className="space-y-5">
         {isLoading ? (
@@ -580,6 +746,14 @@ export function LinkedBerthsList({ interestId }: LinkedBerthsListProps) {
           </p>
         ) : null}
       </CardContent>
+      {addOpen ? (
+        <AddBerthDialog
+          open
+          onOpenChange={setAddOpen}
+          interestId={interestId}
+          excludeIds={linkedBerthIds}
+        />
+      ) : null}
     </Card>
   );
 }