There are 3 tabs that are used in the worksheet: For Sales, itmof, and itbof

I need a VBA that will be embedded on the itmof tab but will effect the itbof tab.
On the itbof tab I need column C to be automatically filled with a letter A only if there is any kind of value (letters or numbers) in column A, starting with row 2 and below. I also need need column T to be automatically filled with the letter N only if there is any kind of value (letters or numbers) in column A, starting with row 2 and below.
Last thing, I need column I to be automatically filled with (the value in column L multiplied by 1.08) only if there is a value in column L, starting at row 2 and below.

So there's no confusion, this VBA will be going on my itmof tab because I need it linked to a button on that sheet, but all these changes should only effect the itbof tab.

Slowly but surely, learning VBA!

Thanks