Expanding a SV9100 requires an expansion card in the main cabinet and an expansion card in the second cabinet, no IP addressing or second CPU is required.
The following blades are required, GPZ-BS10/GPZ-BS11. Each has a dedicated slot in the cabinet, and connects via a LAN cable supplied with the card. In addition, you will probably need more port licenses.
I suggest you call your vendor and get a trained qualified technician to do this.