Suzanne, Charles
That is exactly what I do, and have been doing.

Insert Table of Contents
In options --- assign head 1 to TOC 1, head 2 to TOC 2 and Head 3 to
TOC 3.

At this point I am assinging the head 1 to TOC 1 etc everytime I try to
create the Table of Contents. Previously, these assignments were made
once and then they appeared in the Options list?