This should be so simple, but I can't seem to get it right. I can't
determine which property to use.

I would like to create a button that incrementally adds space before a
paragraph without having to go to the Format > Paragraph dialog box to
manually increase the number of points before that paragraph. I know how to
do:

Selection.ParagraphFormat.SpaceBefore = 12

but what I would like to do is make the button add the a number of points to
the existing number of points, not hard code a specific number. So if the
paragraph has 12 pts of space before, I would like add space, let's say, 6
pts at a time until I'm satisfied with the result. The button repeats the
action every time I push it. Ideally, I would like to have an option to add
space after in the same manner, and I would like to decrease the number of
points in the same manner.

I hope this is as easy I think it should be, and I hope I'm not asking too
much.

Thanks for any help,
Beck