PSE 8 (OSX) Drop out part of photo to reveal another?

i guessing it's possible crop inside 1 photo, drop part out, , thereby reveal photo underneath.

 

but can't find hook in (or in missing manual) let me start researching it.

 

is possible?

 

can give me idea how it? or @ least search in order read it?

 

thanks in advance.

sure. siimplest way layer 2 photos (since have book, it's directions doing manual exposure blend in sidebar in chapter 8) , use eraser tool, or select want rid of , delete top photo. helps feather or refine edge before deleting (all in chapter 5).

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