And to have the table of contents entry (created from the TC field)
update semi-automatically, you can bookmark the various parts and add
them in the TC field:

{ TC "{REF bm1 } { REF bm2 } { REF bm3 } { REF bm4 }" \l 1  }

Note that these nested fields cannot be inserted via the Mark Table of
Contents Entry dialog box; instead, you will have to press Ctrl+F9 to
insert each pair of field delimiters, { }. Then type the code. Press F9
to update. Use Alt+F9 to show/hide field codes. To show/hide the TC
fields, toggle the display of hidden text.

"bm1" etc. are bookmark names; you can use something more descriptive if
you prefer. \l 1 (lower-case L followed by the number 1) indicates that
the text should be at the top level in the TOC. You can type a different
number if you want it to be at a different level.

For a slightly different approach, using STYLEREF fields, see Suzanne's
article at http://sbarnhill.mvps.org/WordFAQs/StyleRef.htm.