You can add an established Group of seeds to a collection or remove a Group from a collection using that Group's management page.
On this page
Add a Group to a collection
You can share groups of seeds to more than one collection from the Group's management page by adding collections to that group.
- Click the Add Collections button
- Click the checkbox next to the collection(s) in which you'd like that Group of seeds to appear
- Click the Add button
Remove Group from a collection
Note: Removing a group from a collection will unshare any shared seeds, it will not affect any seeds originating from that collection.
Click on the checkbox next to the collection(s) you would like to remove and then click Remove Collection