I think what you are reading is for 4.0.x In 3.x you will need to do some php manipulation to get the data you want. You'll need to parse the category name to find the parent category name, then get the category id from there.
For example if you have this category:
Quote:
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Electronics/TV's/Plasma TV's
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the parent category is:
To get that in php you'll need to use one (or more!) of the php string functions. Once you have the parent category name, you can select from the mysql the parent categoryid.
I hope that makes sense. I did some interesting parent category manipulation in this thread:
http://forum.x-cart.com/viewtopic.php?t=11857&postdays=0&postorder=asc&hig hlight=categories&start=15
Hope that helps you get started!
Carrie