Keybind Combination

My friend wanted to play some T mod loader with me but I’m new too it, how could I set my key binds to a combination of two buttons on my controller, since he has so many mods I need to set multiple keybinds to one button which ruins my whole experience, but after browsing the web I can’t find any help on this problem, can anyone tell me how I can do this to my keybinds? (The example I’m showing is a default setting over the controller tab in the menu controls, set to “inventory”.