AddCompLis is dynamic, so you should be able to define a tag in that group just by adding it to any thing's definition. I know some people create "tag mule" ability picks for their user files just to have something holding all their home mad tags in one place.
The other half of the process will be assigning your newly defined tag to each companion race you want to include in the new list. You can do that through the "Extend Thing" mechanism.
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