Can I reuse PCBO Object?

Hi Experts,

    I want to build a solution on top of BOPF along with the capabilities of BOPF framework. In this regard I have developed a custom Business Object. Now I would like to integrate workflows. In this context, I knew that there is a process foundation related to EHSM. However, I would like to reuse the PCBO Business Object by creating a linkage with one of the custom PCO class.  Can you please suggest on this whether is this a good approach or not.

1. Can PCBO linked with the custom Business Object?

2. Can custom bilt PCO class communicate with PCBO business Object.?

Thanks

Pavan