I want to find the column letter to use in a formula. It would be clear when you look at this sheet.

As you can see in B3:D3 I have a formula, which uses a row number from cell G2, but as a column letter I've manually entered it as B, C and D. Is there a way to elminiate this manual portion and write a formula, which would find the column letter too? I've many fields like these, therefore I want a formula, which I can drag.

Thanks for your help.