sub-categories in ebay store?

Anyone had sucess with sub-categories? I was thinking about using them, but I can't even figure out how to make the function work.
Running an Ebay store sure takes a lot more time than a person would think!
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Comments
But, they help buyers find stuff they want once they are in
your store.
eg:
PSA Graded Sports Cards
.....Baseball
.....Football
.....Basketball
.....Hockey
Go to the site map and use the A-Z index for instructions
on how to organize your store.
You can also get help on the EBAY stores board. Don't
forget: ALWAYS use a posting-ID on those boards.