To combine two or more Authority Document lists use the Compare feature in your Workspace.
Authority Document lists can contain up to 100 Authority Documents and you can compare Authority Documents or Authority Document Lists containing a combined total of up to 13,000 Common Controls!
To find out how to compare lists check our our FAQ article How do I compare Authority Document lists?
To find out more on Authority Document list and compare limits check out our FAQ articles How many Authority Documents can I add to my list? and Is there a compare limit?.