I just finished doing a 4 sheet workbook with all types of references and calculation. Alot of the sheets react and change according to 2 drop down lists and basic assumptions on state averages and commission that are built into the sheets. My boss now wants people to be able to change these assumtions if they feel them to be incorrect. I do not want to redo everything. How can I just add a couple of boxes to the sheet and if they input a change it will use those numbers instead of the assumptions?