Sony Reader PRS-950 - Manual (Page 105)

Collections
105
Table of Contents Index
From either the books or issues list
1
In the books or issues list, press OPTIONS  tap
[Add to Collection].
2
In the collection list, tap a collection you want
to add the content.
3
Tap the thumbnail of the desired content 
[Done].
You can check added content in the collection list.
Tip
To select all books or issues, press OPTIONS in the [Add
Books] or [Add Issues] list  tap [Select All].
Deleting a collection
Even if you delete a collection, all content in the
collection will remain undeleted on the Reader.
1
Tap [Collections] at [Home] menu.
2
Press OPTIONS  tap [Delete Collections].
3
Tap the check box of each collection to be
deleted  [Done]  [Yes].
Tip
Also, you can delete a collection using Reader Library. For
details, refer to the Reader Library Help.