in the TOC field, select the "level" of the styles to be different than
any you using for the main TOC.
Then, the table you're creating will have the styles "Toc"+ the level
number.
Format the styles to have the border, alignment, tabs, etc. that you
want.
I don't know how to make it look like a regular table, though.
I thought of "text to table", but that doesn't seem to work unless you
convert the list to static text instead of an updateable TOC.
(how to replace a field with its results? gotta be in the FAQ
somewhere...)