Installation of BPM on already installed SAP Netweaver 7.3 EhP1 Portal with SP3

Hello Experts,

We have installed SAP Netweaver 7.3 EhP1 Portal with SP3 with following Usage Types:

Application Server Java
NW Product Description
Application Server Java Extensions
EP Core - Application Portal
Enterprise Portal

Now we have the requirement of adding BPM to the already installed system. I have few queries for which I am seeking your help. Queries are as follows:

1. Is it possible to add BPM as an add-on to the already installed SAP Netweaver 7.3 EhP1 Portal with SP3?
2. If answer to the above question is yes, then which all components would be required considering the already installed system?

Looking forward to your positive response soon.

Thanks & Regards,
Naresh.