At bizongo.in, we are already building something similar to tackle the problems and inefficiencies in the Indian B2B industry. Currently in its beta, it has multi-user accounts, not only for the buyer, but also for a supplier. We've built a nifty quotation generator, to respond to quotation requests in minutes. This is where having multiple team members on the portal helps, as anyone in the team can respond to quotations. We are also building approval workflows, for both buyers and suppliers, where quotations can be approved, and further orders can be purchased.