Building walls

hi, ive built the floor, grouped it and added a layer called floor.
I now wanrt to use the flor to ofest the walls but i want this to be a seperate group and layer… how do i do this please

You could select that group, copy and paste in place, then assign to another layer. After that, you just edit the new group as you wish.

Check out THE SKETCHUP FUNDAMENTALS. Lots of good info.