Can I create a button that will update a field of every record in a report?

Can I assume that you have tried Grid Edit and its not good enough for your needs?  Are you aware that you can edit the first cell and then highlight the whole column header and then right click to fill down.

Are you also aware of "search and replace" in the more .. menu.

I just want to get the easy solutions out of the way before we get into more complicated suggestions.