I used the = function in the 2nd and 3rd sheets to copy data from the 1st
sheet. I copied the formula into the the existing 30 rows on the 2nd and 3rd
sheets. There is no data entered on the 1st sheet thus returning placemarks
in the 2nd & 3rd sheets where I've copied the formula. How can I hide these
placemarks until data is entered in the 1st sheet.