docs: rewrite work item copy section for the unified copy flow

docs/core-concepts/issues/bulk-ops.md

@@ -31,6 +31,19 @@ You can modify several properties across multiple work items simultaneously:
 - Set or modify modules
 - Add or update start and due dates
 
+## Copy work items
+
+Select the work items you want, then choose **Make a copy** from the bulk actions. Pick a destination project — it defaults to the current one — and confirm.
+
+Which properties survive the copy depends on whether the destination is the same project or a different one. See [What gets copied](/core-concepts/issues/overview#what-gets-copied) for the full field-by-field breakdown; bulk copies follow the same rules as copying a single work item.
+
+A few things specific to copying in bulk:
+
+- You can copy up to **1000 work items** at a time.
+- You need permission to create work items in the destination project.
+- The copy runs in the background, so the new work items appear in the destination project shortly after you confirm rather than all at once.
+- If the selection contains epics and the destination project has no Epic type, those epics are skipped and the rest of the selection still copies.
+
 ## Subscribe to multiple work items
 
 If you need to keep track of several work items at once, you can subscribe to multiple work items in a single operation. This ensures you'll receive notifications about any updates to those work items.

docs/core-concepts/issues/overview.md

@@ -101,19 +101,44 @@ A work item in Project A can be a sub-work item of a work item in Project B. The
 
 ## Duplicate work items <Badge type="info" text="Pro" />
 
-When you need to create similar work items or replicate a work item's structure and properties, Plane lets you duplicate existing work items either within the same project or across different projects.
+Use **Make a copy** to replicate a work item — either in its own project or in another project in the workspace. It's a quick way to spin up recurring tasks, reuse a well-structured work item as a template, or hand work off to another team.
+
+Click the **•••** menu in the work item header and select **Make a copy**. In the modal, pick the destination project — it defaults to the current one — and confirm. The copy always gets a fresh ID from the destination project's sequence.
+
+### What gets copied
+
+How much of the original carries over depends on whether you copy in place or into a different project. Labels, modules, cycles, and estimates belong to a single project, so they can't follow a work item across the boundary.
+
+| Property              | Same project     | Different project                   |
+| --------------------- | ---------------- | ----------------------------------- |
+| Title                 | `<title> (Copy)` | Unchanged                           |
+| Work item type        | Retained         | Destination project's default type  |
+| State                 | Retained         | Destination project's default state |
+| Priority              | Retained         | Retained                            |
+| Start and due dates   | Retained         | Retained                            |
+| Description           | Copied           | Copied                              |
+| Links and attachments | Copied           | Copied                              |
+| Assignees             | Retained         | Cleared                             |
+| Labels                | Retained         | Cleared                             |
+| Modules               | Retained         | Cleared                             |
+| Cycle                 | Retained         | Cleared                             |
+| Estimate              | Retained         | Cleared                             |
+| Custom properties     | Retained         | Appended to the description as text |
+| Releases              | Retained         | Retained                            |
+| Sub-work items        | Not copied       | Not copied                          |
+| Customer requests     | Not copied       | Not copied                          |
+
+The copy is also linked back to the original with a **Duplicate of** relation, so you can always trace where it came from.
 
-To duplicate a work item, click the **•••** menu in the work item header and select **Make a copy**. You'll see two options:
-
-### Copy in same project
-
-Creates an identical work item within the current project with all the same properties, description, and settings. The new work item gets a fresh identifier and maintains the same title, description, state, and priority attributes.
-
-### Copy in different project
+::: tip
+Custom property values are project-specific, so they can't be carried into another project's properties. Instead of dropping them, Plane writes them into the bottom of the copied work item's description — nothing is lost, but you'll need to re-enter them against the destination project's own properties if you want them as structured values.
+:::
 
-Duplicates the work item to another project in your workspace. This is particularly useful when you have similar tasks across multiple projects or want to move work items between teams. The copied work item adapts to the destination project's identifier format and default state.
+### Notes and limits
 
-Duplicating work items is perfect for replicating recurring tasks, or moving work between project phases while maintaining all the essential context and settings.
+- **Epics** copied into a different project need an Epic type in the destination — that is, the destination project must have [Work item types](/core-concepts/issues/epics) enabled. If it doesn't, Plane refuses the copy with an error instead of demoting the epic to a regular work item. Copying an epic within its own project always works.
+- **Archived work items** are copied as active work items, not as archived ones.
+- You can copy work items in bulk, too. The field rules above apply there as well — see [Copy work items](/core-concepts/issues/bulk-ops#copy-work-items) for the selection limit, permissions, and how epics in a mixed selection are handled.
 
 ## Add dependencies