When a new product is imported you will need to either match it to an existing commission group or +Add a commission group. Commission groups are used to group products and services you receive the same rate for.
Top menu >> Import data >> Products
Click the products flag under the Warnings section
In this window you will see the new products imported. To assign the product to an existing commission, click on the product to select it, then click on the group you would want to assigned it to.
Once all products are assigned you will receive the following message. Click the up arrow to go back to the Import data screen.