If you open the A.50.21 Attached Attributes screen for a master tag, the Insert for Detail Tags, Delete for Detail Tags, and Update Detail Tags buttons are enabled. This allows you to add, delete, or update attributes on the master tag level and to apply these changes to all detail tags.
This feature works in the same way as the corresponding Insert on Line Items, Delete on Line Items, and Update Line Items buttons that are active when calling this screen for a header.