In the future, please post questions in the "Support" forum.  The "How to" isn't for questions, it's for completed instruction sets.

With that said…

Are you talking about the subcategories in the body portion of the page, or again in the left margin area?

For the margin, organizing your subcategories by "slug" I think should be pretty easy.

In your "sidebar.php" file, you'll see a couple of lines that begin with:

<?php wp_list_categories(

You'll need to alter the "orderby" parameter of the lines to be "slug", rather than "name".

Here's a page that lists all the possible parameters you can use:

http://codex.wordpress.org/Tem…..Parameters

If you're wanting to organize the subcategories of your body area, then you'll need to edit something in the "functions.php" file.

On or around line #1671, you'll find the function "mkt_setupCatImage".

Within that function, there are 2 lines that have "get_categories" in them.  Within those lines, between the quotes before "&child_of" you'll need to add the parameter "&orderby=slug".

Save the file.

I haven't tested this, but pretty sure it's correct.

I hope this helps.