2 sides QTY in Takeoff

Would you be able to add the ability to add a multiplier value to the takeoff level. When we do 2 sides of a wall the takeoff is always 1 side but then the items we will add a multiplier to double for the second side. If there is a better way to do or think about this I am open to suggestions. I know the way we do it today may not be the best way.