Custom BO and integrate with CRM

Hello everyone,

The scenario is to create an object in CRM and copy it to Cloud for Customer via PI.

In Cloud, we create a new custom BO for that object.How do i achieve the integration part of this? It will be a display only object in Cloud for Customer.

CRM triggers the copy to Cloud for Customer(via PI) whenever changes happen in that object in CRM.

I know we can create new fields and extend them to WSDLs for standard objects (lead, opp etc). But this is a new BO completely.

thanks for your help.