I want to create a spreadsheed using Google Drive in which some columns entries should be retricted based on given value. E.g.: I have some columns named users, item1, item2. In columns item1 & item2 I like to have only maximum 5 users that can make one entry. If more than 5 users try to make an entry, then it should show the message like you can’t make an entry.
How can I do this?