Punch out Catalog in MM (PR and PO)?

Hi,

I have been asked to give the feasiblity of setting up the Punch Out catalog functionality via MM .

I.e. in PR or PO creation the user should click on the Catalog icon and it should direct him to a Vendors catalog , there once User selects the Items the details should be transferred back to the PR ./PO document.

There is no SRM/MDM system involved, we are not using PM/CS catalogs either. Its purely MM catalog set up required.

I have gone through various Posts/ Sap notes but none gave clear directions on what all is required to set up this functionality purely from MM side.

(The SAP note says that this is a Consulting and chargable service?)

All I know is that we have to Set up the OCI details on the Vendor catalog in this node.

More questions :

1- The information to be maintained in this node, needs to be provided by the External Catalog provider?

2- Does this work only for text based items or does it also works for Items with SAP Material codes?

3- If Yes for material codes, do I need to maintain some mapping somewhere between SAP material code and item code passed by the catalog?

4-Can I use Multiple catalogs without any additional Code/BADI implementation?