If you want to track the sales that you bring in for your OWN offers, you can get your vendor tracking link within the offer editor page.

Open the offer editor by clicking on "Vendors" in the top menu and then on "Offers" and then click on the offer you wish to get your vendor tracking link for.

Then, click on the BLUE BUTTON that says "Offer Setup / Options" and select "Vendor Tracking Link" from the dropdown menu.

In the popup window that appears, you will be able to create a SubID (tracking ID) for your link so that you can track different traffic sources, etc.