Hey, 

To my knowledge without customization this isn't possible. 

However we have created a 'Bundle' app that allows you to bundle more than one product (under a product.product) and buy/sell all of them at once, along with other details. 

Otherwise I would suggest maybe creating a purchase order with the usually ordered items of that supplier, and just duplicating and doing some editing where needed as a shortcut.

Please don't hesitate to contact us for more assistance. 

Happy coding and meticulous testing,

Smart Way Business Solutions Team