I have a master sheet and 20 sub sheets. I input data in the master and it filters through to the 20 subs and calculations are done. the problem is that on the master there are blank cells, that need to remain blank cells until i put the data in. This data is copied to the subsheets using a =sheet1a1 type of formula. what happens is when a blank cell is copied it appears in the new location as a 0. I need this to remain blank as the 0 causes calculations that I don't need and mess up a lot of the data I need. Is there a way that when it copies the new location remains blank until the data is inputed in the master sheet?