Deleting comments

You know when you add a bill and you enter a few comments about it, well have a few piled up there and am wondering if there is any way to clen this up and start out fresh, I've tried and can't do anything??????

As you enter more comments the ones at the bottom of the comment list are removed.

gosh gouche I may expand my comments from now on. I too have wondered about that, Thx :-)