It is possible to do what you are asking.
1. Have BOTH asc layouts on the screen, use the TABS at the top left of the Window.
2, On the very top Menu bar is a COPY icon.
3, Left click on it, the cursor should show a COPY icon.
4. Use the mouse, hold down the left mouse key, lasso the section you want to COPY
The COPY section will now appear as a floating sketchy outline.
5. Move the mouse pointer to TAB that selects the circuit you want to copy too, left click it.
6, When the destination circuit is on the screen, left click the mouse to drop the copied section onto that circuit,.