Hi Randy
The extension doesn't work like that. You can simply create a menu item to link to categories view of EDocman. Users can then click on the menu item to see cat1 and cat 2 categories. Click on cat1, they will see subcat1 and subcat2 categories.... and so on.
That's how the extension is designed to work. It cannot so all the main categories and sub-categories at the same time.
Tuan