Registering an existing item.

Ok so am trying to register an item , the item I'm trying to register is Paper but it already exists so what i want todo is like register BankNote which is paper but with a different name etc.
I've tried making a class which extends Paper and then using the static method from itemFactory , registerItem() but it doesn't work.

 

Use second argument of register item function

 

I don’t want to override paper though.

 

Just give a renamed paper?

 

I can rename the paper but with the BankNote I want to add value to the note and remove value that’s my goal

 

And what makes NBT a bad contestant for that?

 

I just want the BankNote to have its own class , btw I am using NBT for it.

 

Why would you use NBT and a custom name and a custom class? If the item only has additional behaviour there's basically no need for it.

 

I would use NBT to store the Banknote value($$$) and a custom name so it doesnt say Paper and a CustomClass because I want to.

 

Well since one item id should only have one set of behavior , how can I correctly override the paper class?

 

Ofc you can create your custom class extended Item, set values to this new item and them register in item factory.
But I doesn't see why you should do it.