I would like to offer Free shipping at the cart and checkout for certain products.
In BigCommerce Dashboard
In ShipperHQ Dashboard
The next step is to specify the Carrier(s)/Shipping Method which will be free for these products.
If you edit the appropriate carrier in ShipperHQ you will see a section called Free Shipping, expand this and select the free shipping method. For example you may wish free shipping to apply to UPS Ground.
In some circumstances, you may also want to filter by attributes (for example, the origin) when offering free shipping. For most circumstances, however, carrier rules can be created to provide free shipping based on combinations of origins, weights, prices, etc.