You can filter on one range per worksheet.  You can remove the filter and
reapply if you want.

If you're using xl2003, you can try data|list.  It looks quite similar to
autofiltering.  In xl2007, I think it's Data tab|Table (or something like
that????).

====
As a general rule, if those two tables show different stuff, I'd use different
worksheets for each.

It'll make life much easier if you want to insert/delete columns or do any other
processing with those ranges of data.