Is it possible to split individual cells into 2 separate cells?

I have a worksheet that basically has 2 sections: the top part alternates
between wide columns (to accomodate long text) and narrower columns (to
accomodate numbers).

On the bottom section, i want the columns to contain mostly numbers, so the
columns/cells don't need to be as wide. Can I split these cells on the
bottom of the worksheet?

Using a separate worksheet isn't really an option, as I want all the data to
be contained on one printable page.

Thanks!