I know the rules state that you can use polycarbonate as cut from a single 12” x 24” sheet up to 0.070” thick
But does this mean the total amount of polycarbonate used on all pieces of your robot cannot be more than 12” x 24” or does this mean no one piece on the robot can be greater than 12” x 24”

You need to be able to show that everything could be cut from one 12"x24" sheet of polycarbonate. The 12"x24" size is a maximum allowed.

If I have a team that uses a fair amount of the 12x24 allotment, I make there they have a template in their engineering notebook that shows how all of their pieces can be cut from a single sheet. This has been helpful for inspection.

Ok thank you for the clarification