Cant figure it out

how can I select multiple layers so i can copy them all. i need to move the city i made to mid map and cant figure this out

Unfortunately this is not supported yet. Maybe as an alternative, you could offset your entire map using the Offset Map action. Of course that only works if you don’t mind the rest of the map shifting around as well. If that is not what you want then you will have to use the stamp brush or cut/paste to move this area in each layer separately.

Multi-layer copy and paste is covered by the following github issue: