How to apply restriction on a column value based on another column value in Excel

Question

I have come across a requirement where I need to apply restriction on column C based on values in column A

Suppose,

Column A value = "DSOC", Then I don't want any value in column C.So if user tries to make an entry in Column C it should throw an error showing that Column C entry not allowed for "DSOC"

Column C entry should be done only if Column A value is = "DSOF".

Answer 1

You can use Excel's Data Validation feature to achieve this. Select the entire column and then implement following formula.

=ISNA(VLOOKUP(B1,A:A,1,0))

Refer below snapshot.

Answer 2

I was able to complete the requirement in the following way.I just found the address of the cell which I tried to edit by using the below formula in the screensot

If the value is DSOF then I am displaying an error message