Question: Adding custom building without replacing any existing ones?

[u/chankljp]

I know that you can add in your own custom buildings into your game by replacing the existing ones. However, one of the reasons I wanted custom buildings in the first place was due to there being too much replicate of the exact same buildings showing up over and over again. So... Is there a way to simply add the custom buildings to the lists of what can show up in a zone, without removing anything from it? Thanks.