B2B scenario in SAP PO

Hi Experts,

We have to start with the development of B2B scenario in SAP PO 7.4.

The scenario is as mentioned below :-

SAP ECC ------> SAP PO -----> B2B VAN Provider----> (various customers)

After going through some of the blogs, listed few points which seems to be confusing to me -

1) How the TPM configuration could be done in this case? We tried with one doc but its somehow confusing.

(http://scn.sap.com/community/b2b-integration/blog/2014/01/28/trading-partner-management-part-1)

2) How the configuration will be done? Creation of party, agency and schema? Identifiers tab of the communication channel.

(http://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/cdded790-0201-0010-6db8-beb9bb2b2660?QuickLink=index&overridelayout=true&5003637721826

Gone through the above mentioned link, got confused about the configuration part.

As per my understanding,

Sender party --> no need to create as landscape is same.

Receiver party --> Mandatory to create, but what needs to be put in Agency, Schema and Value?(around 50+ customers for one VAN)

Is my understanding correct? Please correct if i am wrong.

Please guide, if someone has worked over B2B SAP PO 7.4.

Thanks!

Br,

Nidhi