Currently, the only means to proceed is to edit the merged PDF manually as there is no current means to mix-and-match what is merged to the converted PDF file.

We understand the need for this sort of feature and suggest that you create an Idea on our Community page to this effect. Please navigate to https://community.blackbaud.com and log in or create an account. Once logged in, you may navigate to Products tab > Microedge. From there, click the Idea tab and search for the Idea. If one does not exist, you may log the Idea. Remember, the more votes an Idea receives, the more traction it will build with our Product Management team, so please encourage your colleagues to vote on the Idea as well!