Getting floor layout of a building...

The other day I was working on a city map. I clicked on something that extracted the outer wall line of a building and generated a new file with this outline.
But, for the life of me, I can't remember how I did this. Can someone please walk me trough how to do this... please.

I need to know where to click... i.e. which icons, extra...

Yes, I did search, even googled but info for CC3+ is very limited.

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