Use RG Data type: Text
And use :merge with
Ex: Do a search for Company’s name: merge with Do a search for Category’s name:merge with Do a search for Employee’s name
OR, you could create 3 separate RGs, one on top of the other, with exact same formatting, that would display different Things (tables) in what seems like the same format for the end user.
If there are no results of a particular type in this search query - you can set up the RG to collapse if empty.
May be a little more data intense overall, but gives you more ways to interacts with the actual objects, both for search and for further steps down the line,