Contact Person Replace Functionality

We need to create a new screen in CRM 7.0 Web UI where we can search for a contact person, and copy his/her:

1. Partner Functions (by selecting from currently maintained partner Functions)

2. Communication data (by selecting from maintained communication data)

What BADI or BAPI can we use here? what is the best way and place to integrate this into the Web UI Functionality?

Thanks,

FK