Shipping Question

I am wondering about something - in previous versions of the cart I would setup 2 or 3 suppliers for the cart to allow me to create seperate shipping methods for certain items - so example if the site sold paintbrushes - I created a supplier and added those products to that supplier and then create a shipping method to handle it accordinly - small cheap item

I then did the same for paint product - 5-10 gallons can are heavy so I wanted different shipping rates etc - worked perfectly - add a brush and a can get 2 shipping rates on the cart page - how in the world do I accomplish this in MV version - vendors can set a shipping method but dont know how they would handle various product sizes etc?

Anyone know something to help me?

Thanks in advance