Hi JasonRoy,
Do you mean the appearance of the actual category listing on the left side of your page whenever you click on a root category? For example, if I click on Drivetrain as a root category, there are Lockers, Performance Gear Oils, Ring & Pinion, etc. as subcategories which display on the main body of your page. Would you like these subcats to always be visible on the left side when the user clicks on Drivetrain?
For example:
Braking
Drivetrain
Lockers
Performance Gear Oils
Ring & Pinion
Steering Box Braces
Engine
Exterior
Interior
I can help with that, but if you'd like another design you might want to provide a little diagram for us to follow
