I’m sure this has been asked before, I just can’t seem to find the answer. I was wondering if there’s a way to focus on a subtool and rotate around that one specific subtool. I asked a few co-workers and they don’t know either. 
Thanks!
Two ways:
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If the selected subtool is the only visible subtool then the rotation center will be that subtool.
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If you switch on Transform>Local then the rotation center will be the last edited point.