how to setup automatic generation of item number based on item category when create new item ?

Summary:

how to setup automatic generation of item number based on item category when create new item ?
for example:
predifine:
when category is A then item number start with RA001
when category is B then item number start with CD002

then when i create a new item, i select category A for it, then save, the item number will be RA001001

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