If you're scooping shortening out of a can rather than using the already marked-for-measurement sticks, here's some guidance on how to get the amount you need.
To measure canned shortening, use nested metal or plastic dry measuring cups. The top edge of the cups are flat to allow excess dry ingredients to be leveled off. Pack the shortening into the cup to get rid of the air pockets. Use a straight edge such as a spatula or knife to level the top. If you are using sticks of shortening, measure the amount needed by following the guidelines printed on the wrapper.