Hello, I'm relatively new to wp/php, and I'm looking to customize my sidebar navigation. My intention is to have the sidebar list the various categories, and when a particular category is displayed, then (and only then) have the subcategories display beneath the category header in the sidebar. (An example of this is on http://wordpress.org/extend/ when you click on 'plug-ins' a subcategory menu appears indented beneath 'plug-ins'.)
I have been able to figure out that this can be done by creating different templates for each category (each of which would pull a unique form of the sidebar), but I have a feeling that this is a common functionality and is handled somehow by either a plug-in or some basic php programming involving the loop. What this might be, however, escapes me. Any help in addressing this would be greatly appreciated, keeping in mind that I'm not exactly a sophisticated wordpress user and am still trying to understand the basic concepts. Thanky.