Then the solution is to give him edit permissions on your sheet. This limitation on rolling from other sheets is intentional so that people can't use abilities on sheets that aren't assigned to them. Edit: Actually, you might want to ask in the API forum. I think there might have been a script at one point that could keep a duplicate sheet updated as changes were made to the original. If the game creator has a pro subscription, then they might be able to use the duplicate sheet for your friend to see as Jordan C. mentioned and install an API script to keep in updated as you make changes on your original sheet. If the game creator doesn't have the pro subscription, then you are back to sharing control of the sheet.