Assuming you ean "TOC" and not "index", yes, the TOC is lost during the
merge.

If you just want the same text that you see prior to the merge, you might be
slightly better off if you remove the \h and possibly \z switches from the
TOC field. Or you could select the TOC and use ctrl-shift-F9 to replace the
field by its result.

However, the chances are that the TOC is not going to work the way you want
during a merge. First, there will be one TOC per erged record unless you use
soething like { IF { MERGEREC } = 1 "{ TOC }" "" }. Second, the  TOC does
not update correctly, so that even if you are using Heading styles to
generate your TOC entries, you will not get the correct results. Third, if
you are using any bookarks and possibly other TOC features which are
destroyed durign the merge, you will not get what you want.

In soe cases it may make sense simply to insert the TOC after the merge and
execute it. You could store the TOC with all the switches you need in an
AUTOTEXT entry, insert it using a macro, keep it in a separate document and
include it via an INCLUDETEXT field(which should survive the merge and might
do most of what you need, but beware if you are sharing this file amongst
several erge main documents.

Peter Jamieson