Doubt in Creating Multiple Business Systems.

Hi All,

I have a requirement, need to create scenarios for two countries(india and china). All scenarios are Idoc to EDI and vise versa. We have only one SAP ECC and one SAP PI System in my landscape.My doubt is how to create two different Business Systems(India and China) using one ECC System.I mean how to differentiate two countries with single ECC system?

Thanks.