You could insert your instructions into the same table, instead of into a textbox. All you'd need to do is to merge the two cells for that row and add a border to it. The alternative is to split the table at the appropriate point and position the textbox in the gap.

You don't need to create a separate table for the second column. As soon as you have more rows than will fit in the left column, Word will start using the second column. If, however, you want to use the full page-width all the time, you have two options, depending on whether you want a down-then across layout of an across then down layout. For the former, all you need do is to insert a Section break following the table, with the following Section formatted as a single column. For the latter, you'd need to use at least a 4-column table, with a pair of narrow columns and a pair of wide columns. If you want more space between the entries, you might also insert an empty column between the left & right sets.

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