PME Configuration SAP CRM 2007

Hi Gurus

Need your help,

Currently we are using SAP CRM 2007.We need to configure the variant configurable products,I think in CRM we need to use the PME to configure the variant products,Is the PCM is inbuilt in CRM? or we need to install any software,yes please give me downloadable path.

After configuring the Variant products we need to display in b2b e-commerce portal,

Is any body having any idea please send the response ASAP.

Awaiting for ur response

Regards

Satish