I need to have a running difference between amounts from 2 different cells. For instance, in cell A1 I have 10,000 and in A2 I have 5,000. However, in cells B1, B2, etc. I have varying amounts. I need a cell, such as A3 to keep a running subtraction from A1 until it reaches zero (0) and then to switch over to A2 and subtract from the 5,000. Can this be done?