Before you start re-inventing the axle, have a look at what you can do with
AutoText. It's a different approach from your current thinking, but the
functionality is all there already.

Apart from that, you could add four bookmarks - one for each paragraphs,
then in your code check which bookmark contains the current selection and
delete the other three. But the total effort involved -- select within
exactly one of the paragraphs, call the macro; plus your task of providing
some way to call the macro, supporting the macro, and teaching the users to
use it, is -- it seems to me -- a lot more work than simply selecting the
paragraphs you don't want and pressing delete.

Hi Laura

Yes, AutoText (4 entries in the same "category" aka style) and an
AutoTextList field might alredy be all you're looking for.

HTH
Robert