How to distinguish transports in sap system while releasing request

Hi,

I have 2 test systems in my landscape, one is for system test(system 1) and another is for integration test(system 2).

now i have a requirement to differentiate transports while releasing from Dev system. Drop A transports should be imported to both systems(system 1 & 2) and drop B transports should be imported to system 1 only. Both transports should be going live in different months.

How this can be implemented(Will creating projects in SPRO or creating transports groups in STMS is possible)?

Can any one please suggest me.

Regards

Chandu