tModLoader Mod request

[AlainZv]

Hello, i was wondering if theres any posible way (mod, or external tool) to make vanilla npcs inventory larger, or make them sell items in diferent shops sections, because happens that when you uses lots of mods, sometimes the sell repeated items, or their inventory is all full so you cant actually get some of the items they are suposed to sell
is that even posible?
thanks