I am building a marketplace in Magento using a third party extension. We have our own products in addition to third party sellers products. Te sellers products are shipping based on a table rate. Our products will ship free. I want to set up a rule that will display the option for free shipping if all of the items in the cart are ours (ie:
seller id = null) but if there is a product in the cart that has a seller id associated with it display that sellers table option. Right now, both free shipping and the table rate are showing in one page checkout in the shipping methods panel. What file is the best location to begin setting this up?
Edited to add: Technically this could be as simple as just not showing the "Free Shipping" Option if there are items in the cart where seller id > 0. I'm just not sure where to accomplish that.