Manually adding to an already created data merge

Hello! I have created a school directory through the data merge process - each entry is in its own text box with a line between each entry. It looks great. BUT.... I have just been advised there are 18 families that need to be added. I would like to manually add them into the document as that seems like the best and hopefully quickest option (there is an 'issue' in our data base so I am hesitant to 'start a new merge'). How can I insert a text box to the current directory list of text boxes where the space would be 'opened' into the correct area and all following entries would 'move down' . Is there a way to move all the entries (which are in individual text boxes) that follow so there is room for the new entry? Thank you.