To update an adder so that the dealer fees do not calculate, first view the adder pricing. This can be done by clicking Settings > Pricing > Adders and then clicking on the name of the adder.
Next, click the edit icon next to the existing pricing option.
If the type dropdown is set to fixed price or price per watt, change to custom. Any pricing already entered in will update to the custom pricing model.
Click +Add next to pricing model inputs.
Enter skipDealerFees in the name field (capitalization matters!), change the value to Boolean, and select "Yes."
Click the check mark to save the new field.
Click Update Pricing Option.