Is there a way to bypass Request for Quote and then Purchase Order and just enter a Vendor Order directly?

When I order consumables or components, I log into a Vendor website, select the items I need and pay for the items at checkout, just like a regular retail online purchase. 

I would then like to enter the order into Odoo and assign each line item an Account which will always be a COG or materials and have it update the item inventory count.

Thanks in advance for any process that can keep it that simple.