When I'm working on a project I typically use a common set of tags for all layers and items associated with the project. Some unique ones, too, but many that are the same for all. I always have to pick these same four or five tags, one by one, for each layer. I'd like to designate a set of tags as a collection that would be represented by a single tag. When I add the collection tag to the Tags box, it populates with all the tags that belong to it.