You cannot create a TOC style. There are nine built in and you must modify them. Word will not use any others unless you manually apply them each time you update your TOC.

See TOC and Direct Formatting
Note that color applied to the source headings as part of the paragraph style will NOT be reflected in a TOC. It must be direct formatting.
http://wordfaqs.ssbarnhill.com/TOCTi...rectFormatting

If you are only having three levels in your TOC, assign three of the TOC styles to each target group. You can modify their appearance so that TOC 4 and TOC 7 look the same as TOC 1 except for the color, etc. Then rather than going for heading levels, use the styles. I.e., Heading 1 --> TOC 1, Heading 1 Green --> TOC 4, Heading 1 Red --> TOC 7.


This is limited to three groups of three but would be a workaround. If you have more than three and only wanted the top level in your TOC with the color, also with three levels, you could have seven groups.