Simple. Assuming it's a two-column table:
1. Insert a field in the first cell, coded as:
{SEQ Nr \r {FILLIN "Starting #"}}
2. In all remaining cells in the first column, insert fields coded as:
{SEQ Nr \n}
3. In all cells in the second column, insert fields coded as:
{SEQ Nr \c}

To update select the entire table and press F9.

Note: The field brace pairs (i.e. '{ }') for the above examples are all created in the document itself, via Ctrl-F9 (Cmd-F9 on a Mac or, if you’re using a laptop, you might need to use Ctrl-Fn-F9); you can't simply type them or copy & paste them from this message. Nor is it practical to add them via any of the standard Word dialogues. The spaces represented in the field constructions are all required.

__________________
Cheers,
Paul Edstein
[Fmr MS MVP - Word]