The Attribute Groups section also includes functionality to associate Attributes within a group to selected products or all products. The PublishAssign / Unpublish Unassign option allows you not only to add attributes to specific products, but also to remove them.
...
To do this, complete the following steps:
...
From the Catsy dashboard, click “More” > “Attribute Groups”
Select an Attribute Group
Click “Publish“Assign / Unpublish”Unassign”
Select “Add attribute group to specific products or variants”
Enter product numbers in field that appears, one per line
...