I would like columns C & D to concatenate with a space and a comma seperating
the two words in each of my many sheets. the columns remain the same all the
time.

How do i do this? i tried using the concatenate formula in my macro code but
it didnt work as i dont really know how to refer to all sheets. Ideally i
would like a click of a button to concatenate C & D (with comma and space) in
each of my sheets.

thanks.