How to add an extra navigation menu in the PestaShop 1.6 default theme?

[StrangeAttractor]

Having the top horizontal menu being not enough for me (I need to expose more categories than fit there and I'd also like to group the categories in 2 seperate panels by their meaning: the top menu shows by-brand ("made by") categories and the other I need to group the goods bay actual "what they are" categories).

 

So how do I add an extra menu? A vertical menu would be preferable but I also don't mind just adding an extra instance of the horizontal menu module right after the first one.