Shelves are used to organise your CDs
Set quicklist or favourites
Set a Home Screen quicklist or favourites from the 'Home' Menu option on any screen showing multiple CDs
Merge Two Shelves Together
The Merge Value option on the Value's menu
on the List Values Screen for the shelf field
by Long-Pressing on a (shelf) Value
The Rename option on the Shelf's Menu on the Shelf Screen
Delete a Shelf (Keeping CDs)

The Delete Shelf option on the Shelf Screen
Choose to Keep CDs
The Delete Value option on the Value's menu
on the List Values Screen for the shelf field
Move a CD to a Different Shelf

The Change Shelf option on the CD's menu on the CDs Screen
Press a CD in a quicklist on the Home Screen
Selecting a new value in the shelf input on Edit Details Screen
Typing a new value in the shelf input on Edit Details Screen
Export a Shelf

Choose the Export Shelf option on the menu on the CDs Screen
Refer to the Export Screen for more info
Import a Shelf

Choose The Share/Import option on the side bar menu, then choose import