How to combine the universes from different repositories

We cannot link universes which are built on top of different data sources, but we can built reports from them in webi through multiple universe option.

Another way is by creating schema using DATA FEDERATOR on multiple data sourses, after creating a schema we need to export it to universe. And then we can use the universe for reporting.

you can combine two universes by using link parameter, but at that time two is same database,suppose one is local repository another one is server repositories you combine to both universe to server repository or local repository