I've sort of scanned this thread so I could have missed something vital, but ..

Are you saying you want some text in the result of the merge subject to some of the data you are merging?

So if you merge "Heart" somewhere you want, say, paragraphs 1 and 3
And if you merge "Liver" you want, instead, paragraphs 1 and 2

If I am right, you can do it all with the merge - indeed that's what merge is all about - without any code. What version of Word are you using?

Or is it more complex? Or am I completely off the wall?