Click on the Options button at the bottom of your catalog listing and you will get some of the options that you need:
The alternative is to use a third-party tool set like Steve Kubis' Paragraph/Character/CrossReference/Table/Color/Variable Tools at: Silicon Prairie - FrameMaker Products
These will allow you to list all tags in use and to delete all not in use; map tags between documents (great for importing from other document types like Word), etc. Well worth the price.