How can i tag my existing APIs into the Project for better tracking

Hi All

I am exploring method , to tag my existing APIs into the project …By default i created all the APIs under my oragnization bucket but now to monitor the project wise billing i need to put the APIs under each project . but issue is APIs are already created to put under the project , i need to create the fresh APIs under each project and track it but i cant delete the exisitnf APIs …do any method exist by which i can tag the existing APIs into newely created project ?