You do not have to delete and reinsert the cross-references but you need to
update them.
If you use the built-in Heading styles (Heading 1-9) for your headings, you
can insert cross-references to those headings without manually bookmarking
the headings. In the Cross-Reference dialog box (opened via Insert tab >
Cross-rererence), all headings formatted with Heading styles will be listed
when you select Heading as the reference tab. Accordingly, you can select
e.g. Bookmark as the reference type and all manually inserted bookmarks will
be listed, ready for being cross-referenced.
If you turn on field shading (option found below Office button > Word
Options > Advanced category), you will see that a cross-reference is actually
a field. You can view the field code if you select the field and press
Alt+F9. If you insert a cross-reference to a heading, you will see that the
field code consists of something like:
REF _Ref223280573 \h
The _REF+number is the name of a bookmark that Word adds around the text to
which the cross-reference points.
If you have inserted a cross-reference to a heading or a bookmarked piece of
text and you change the heading or bookmarked text, you will need to update
fields: Select the entire document (Ctrl+A) and press F9 to update fields.
This updates the cross-reference fields so they reflect the changed content,
page number or whatever you selected to reference. If you delete a heading or
bookmark that has been cross-referenced, you will see that the
cross-reference field shows an error when updated. You need to delete such
fields.
Note, however, that you need to be careful in some situations when you edit
headings or bookmarked text that has been cross-referenced. Otherwise, the
_REF bookmarks may end up containing more or less text than it was supposed
to and your references will show something wrong. I have made some demos that
illustrates this and shows how to prevent such problems. See:
http://www.thedoctools.com/index.php?show=wt_cross-reference_trouble
--
Regards
Lene Fredborg - Microsoft MVP (Word)
DocTools - Denmark
www.thedoctools.com
Document automation - add-ins, macros and templates for Microsoft Word