You could create a table with a number of narrow columns (and maybe a couple
of rows depending on the desired format). You can then insert the bookmark
content in each of the cells (insert content in one cell, copy it, select the
remaining cells and paste).
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Regards
Lene Fredborg - Microsoft MVP (Word)
DocTools - Denmark www.thedoctools.com
Document automation - add-ins, macros and templates for Microsoft Word
Although a table will work for this, I prefer to use snaking columns because
it's easier to make the margins uniform (make the distance between columns
equal to the sum of the left and right margins). I create the copy in a
single column, insert a column break, then copy/paste into the other
columns. I usually do them three-up on Letter or four-up on Legal.