Product groups are used to configure unique shipping rates for different groups of products in your shop.
Examples of using Product Groups:
Groups for different dropship vendors
The classic example of using a product group would be to set-up rates for each of your different dropship vendors.
Free Shipping Products
For some products you offer free shipping, so just create a new group for those products, and add your regular rates to the Default group.
Different Per Item Ship Costs
Set-up groups of products with the same ship cost. So a group for products that ship $5/item, a group for products that ship $10/item, etc.
Different carrier rate settings
You could have one group of products that are large and ship in their own box, so you can create a group for them, and add carrier rates with package settings that are for a product shipping in its own box.

Add Product Group

For a in-depth explanation of adding product groups and assigning products to a group click the link below:
User Manual: Product Groups

Add Rates to the New Group

For an in-depth explanation of the shipping rate options and adding rates to a group click the link below.
Get Started With Advanced Shipping Rules: Add Rates

When there is a single product group in an order
When there is a single product group in an order, the app will show whatever rates have been set-up for that group.

When there are multiple product groups in an order
When there are multiple product groups in an order, the app will show a blended rate. Which by default will add together the lowest cost shipping rate from each product group together.

Learn more
User Manual: Product Groups
User Manual: Rule Based Rates
User Manual: Carrier Rates

Next in Getting Started

Getting Started with Advanced Shipping Rules
Before you Start
Calculated Rate feature is required to be active on your shop
How the app connects to and syncs with your Shopify Shipping Settings
Configuring Rates
Add Product Groups
Testing Rates and Going Live
Common 'gotchas' while setting-up the app
The app cannot modify, edit, adjust, control, influence, or hide your pre-existing rates
Be careful if you didn't re-configure your existing rates into the Default group