Can I edit my inventory within Square's dashboard?

Now that your Square account is linked to Rose, all inventory edits, additions and deletions must happen in Rose. The reason for this is that Rose must control the Square token that identifies all inventory items. If Rose doesn't instigate the edit, addition or deletion, essentially that item can be "lost" in Square as Rose will no longer be able to see the item as the token as changed or Rose isn't aware that the token exists for a particular item. This will lead to duplication of items in Square. 

See Take-In Inventory Entry or Editing Inventory to understand how to control inventory in Rose.