How to remove cells after selection from list function

[asankar24]

Hi All,
I am Sankar, a Chartered Accountant by profession. I have a query, will be happy if you can solve this;

the below are the values of list function
a. Geography
b. time
c. quantity
d. period

I want to use 'list' function to select one of the options from c7 to f7 (as column wise selection). However if any item is selected earlier should not be listed subsequently. For eg in c7 if 'time' is selected, that option should not come from d7 to f7.
Kindly tell me how to do this.
Thx
-Sankar

[royUK]

What "list" function?

[asankar24]

List is one of the options in data validation