If you have at least Level 6 permissions, on the list of Inserts/Related Sets for a main set, to the right of every insert/parallel set is an edit button (square/pencil) where you can update the name, card count, type, etc., and at the bottom of the list is where you can update card numbers and notes for a range of cards. Just please be very careful when using it. If you don't have the required permissions yet, just submit an IR and we can handle it for ya.
You need Level 4 (L4) permissions to edit Note1, Note2 and Glossary entries
You need Level 6 (L6) permissions to edit the insert/parallel types and card counts and do mass edits on notes
You need Level 7 (L7) permissions to edit the insert/parallel names and card numbers
Also the proper ordering of the Note1 field for that type of card would be "AU, MEM, SN1"
* Ed * L8 * Cards in my personal Collection are unavailable *