How do you add a custom tab to existing eBusiness Center form

Is it possible to add a custom tab, apart from the existing two custom tabs, to the existing eBusiness Center form? If yes, can anybody help me figuring out how it could be done? The requirement is client wants to add 4 custom tabs which is different information and also different (custom) tables. Does anybody have documentation regarding addition of custom tabs and how the design should go?

Thanks in advance.
Regards,
Anil Bejugam