To add subsequent sheets, do them one at a time.This will change the names of the pasted components (and their nets) in the PCB to reflect the names used in the schematic.Go back to the schematic and 'Update PCB document' like normal.I was able to click click click them across to the matched column without changing anything. if you have only 'designator' ticked at the bottom, they will automatically match based on the first letters.from PCB editor Ribbon -> Tools -> PCB Links -> Component Links.Use the Component Links to link the unmatched schematic names to the new pcb names you copy and pasted.the copy of 'R7_1' will be named 'R7_1_1' When the components are pasted, the names will automatically have '_1' appended.Copy and paste the nicely laid-out 1st instance, include all components, nets, vias etc.Delete the newly added components from instance 2 - not the ones you have already laid-out!.It will also add the components represented in the 2nd instance of the sub-sheet, (with the appropriate suffix) in a straight line, off the sheet as normal.This will change the names of all the components in the completed layout by appending an underscore and the sheet symbol designator you used in the schematic.Use simple designators for the sheet instances like 1 and 2.In the schematic: Add a second instance of the sub-sheet.Make it nice and tidy, right through to silk screen layout, check for errors etc. Update your pcb document and do the layout.Create the schematic using hierarchical sheets (it sounds hard but its incredibly simple).While the sheet entry is big time saver for schematics, there is no automatic way to propagate this through to the layout. I have received feedback from CS development.

Altium layout