Since version 3.1.1 UdmSearch has nested categories support.
Categories support is _alpha_ code. And there are no docs. :(

First you need to create tables for categories. For MySQL, use
create/mysql/categories.txt.

There is a categories editor written in PHP3 included in this distribution.
[FIXME: there's that editor?!!......]

FIXME!!! More information required :-)
