Assigning tree component to display only a branch of XML structure, not all?

I have a database of items in various categories, organised as a tree structure, and displayed in a tree component connected to an XML source. In my app, I want to also include drop-downs of the categories , so the user can filter the tree, so it only shows items under that category/branch header.

So my problem is this: Can I, and how do I, reset the display of the tree component to only display items beginning at a particular node (the category chosen by the dropdown ) of an already-created XML object.

Do I have to duplicate the branch to another XML object? (If so, any suggestions as to the fastest way (in terms of CPU speed)?

Of could be a simple as saying something like: "Set XMLsource of tree Y to node of XMLobject X" ?

Thanks for you advise :)
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