I picked up a small job for family friends to do some excel formulas for their payroll scheme as a favor, but i ran into some trouble. The problem is, the sheet they gave me needs to be filled out externally, i cant change anything on it (ie formulas, numbers). I was curious if i would be able to open up a copy of the original document on a separate sheet, have the formulas and values entered on the copy, then have it fill in the original?