NPC requiring a multiple items before you can purchase

[Ylisse]

Is it possible and would anyone know how make items require a certain amount of different items before you can purchase it from an NPC, like a shopping list? So for example a buffscroll you must have 10 copper, 3 gemdust, 1 crushbone etc

I'm aware I could use production skills for it but in some cases an NPC would be convenient, If anyone could help that'd be great, thanks in advance! :

 

[linian]

yes it is possible