Thank you for the support. I have investigated further and learned how to create Sellers.
But now I am observing another issues. Completed purchase transactions are not appearing in the Transactions section. All Sales are setup as Cash On Delivery with no Payment processing online. Secondly, although I get the transaction successfully completed message, the quantity of the product purchased is NOT getting decremented. If I have 2 items and even if someone had purchased both items, the Product listings still shows 2 as available.
Is there anything I need to do to decrements the quantity.