Help with copying and adding a numerical value

Hi there,

I hope someone can help with what I'm assuming is something fairly basic......

I often need to write columns with say, W1, W2, W3, W4 etc etc, and I don't know how to retain the "W" bit and then add a number as I copy it down through however many rows I need it to.

Is this possible, and if so, how do I do it?

Thank you in advance.