Need a formula or macro that will allow me enter a 1 into a cell, on sheet1, lets say B2, and subtract it from a cell H3 on sheet2. Sheet2 H3 =10. When I enter the 1 it should subtract the 1 from the 10, and make H3=9, and when I do it again, the value of H3 will be 8, and so on till it reaches...