This code needs to apply to one row at a time.

Column A - each cell has data validation -- possible values of Yes and No.

If the user chooses 'Yes' in A1, I need to unlock B1 thru D1 (and keep them
that way), otherwise those cells should be locked.

Same thing on row 2, etc, down to possible 300 rows or more.

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thanks for your assistance,
cm