Can I add more value in INItemTypes.List in stock item type

Hi @vannakheng66 

Yes you can, “But” you will affect the underlaying logics that consider those types in special ways, whether they are non-stock items or stock items. Item types are used in many process across the system. You can do a quick search just to have an idea:

I recommend to add a custom field to handle the additional types. Make sure that the behavior of the list is by ItemType, so your logics will be tied to the ItemType that is selected (Behave like...)

Happy coding!