force entry based on other cells

apgmin

Board Regular
Joined
Mar 1, 2010
Messages
150
Office Version
  1. 2013
Platform
  1. Windows
Hello!

Suppose I fill any value in cell a1
How do I prevent entry in any other cell unless cell b1 is also filled
 

Excel Facts

What is the last column in Excel?
Excel columns run from A to Z, AA to AZ, AAA to XFD. The last column is XFD.

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