UFUNCTION Category CategoryName usage

The categories are just parsed at build time. You can use any name you want, there is no table or list you need to edit.

UFUNCTION(BlueprintPure, Category="MyCustomCategory|MyCustomSubCategory") // The quotes are optional. 
void MyMethod();

How do I use CategoryName to specify a UFUNCTION “Category”, is there a specific file where I define the CategoryNames ?

The documentation has

* Usage: Category=CategoryName or Category="MajorCategory|SubCategory"
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