CHASE’S EXCEL CHEAT SHEET
Make Cells Equal 100%
1.
2.
3.
4.
5.
Highlight cells A1:A4
On the ribbon, click Data
On the Data Ribbon, click Data Validation
Just below Allow, choose "Custom" in the dropdown
In the formula bar make it read:
=SUM($A$1:$A$4)<=1
6. Click OK
For a Checkbox – DEVELOPER TAB  INSERT  CHECKBOX