how can I merge two cad files? like combined machine which do two functions.

I need to make a mill/drill/lathe machine, and I got from grab cad a "mill drill" model, and another for lathe.
Is there a possible way to merge the two models into one?
I need to make a mill/drill/lathe machine, and I got from grab cad a "mill drill" model, and another for lathe.
Is there a possible way to merge the two models into one?
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