How do I keep a merge field letter from moving up.-Word 2003

[CM]

We have letters that we have created that merge with our other program. The
problem is that we have fields at the top and bottom for address is (6 each)
which if they are not all filled in then Word automatically moves the entire
letter up that many spaces which in turn moves the bottom address up.

The problem is that we need both the top and bottom addresses to remain
where they are so they will fit into the envelopes that we are using. We have
many letters that go out each day and are not folded by hand. Therefore, they
must remain at the same fold.

 

[Terry Farrell]

Without seeing a sample of the before and after merge, it is difficult to
give an exact answer, but as a guide I suggest that the top and bottom
address could be inserted into a Frame with the frames being anchored to the
Top and Bottom wrt to the page.