Good Afternoon!

I've seen a number of posts related to data validation and only allowing 'Letters' to be entered into a particular cell, but I haven't seen what I am looking for... In fact, I've not been able to piece together a solution from multiple related searches.

So without further ado...

I am creating a document that I can share with others which restricts what the user can successfully enter. I can use Excel's standard data validation options for all but 3 columns on my spreadsheet which MUST be letters only (A-Z) and have varying length restrictions 30, 50, 120...

Thanks!

BMH