I think you'll need to start over, using a Word table instead of the textboxes. If you create a table with a cell structure arranged so there are cells overlaying the positions where you need the output to go, then insert the mergefields into those cells, you'll then have two options:
1. Use the document as is for a directory merge (you may need to adjust the size of the empty paragraph that follows the table cell to get the alignment right for the 2nd record on each page; or
2. Copy the table and paste the copy below it. This will allow you to use a letter or label merge. You'll need to add a «NextRecord» field between the last mergefield on the first portion and the first mergefield on the second portion.

__________________
Cheers,
Paul Edstein
[Fmr MS MVP - Word]