Docs: Export/import from CE to EE and vice versa

doc/user/project/settings/import_export.md

@@ -82,6 +82,13 @@ Projects can be exported and imported only between versions of GitLab with match
 For example, 8.10.3 and 8.11 have the same Import/Export version (0.1.3)
 and the exports between them will be compatible.
 
+## Between CE and EE
+
+You can export projects from the [Community Edition to the Enterprise Edition](https://about.gitlab.com/install/ce-or-ee/) and vice versa.
+This assumes [version history](#version-history) requirements are met.
+
+If you're exporting a project from the Enterprise Edition to the Community Edition, you may lose data that is retained only in the Enterprise Edition. For more information, see [downgrading from EE to CE](../../../README.md).
+
 ## Exported contents
 
 The following items will be exported: