Need a fee added to cart based on quantity

[kp1414]

Hello, 

I am building a store that needs to be able to charge an additional delivery fee (essentially double the fee) based on the quantity of the product in the cart. 

For example, One delivery truck can fit 12 cubic yards of material. If a customer orders more than 12 cubic yards than they will need to be charged an additional delivery fee because it will take two trucks to deliver the load. 

Does anyone have any recommendations on the best way to set this up? Or what app to use?

[AvadaCommerce]

Hi @kp1414 ,

1. From your Shopify admin, go to Settings > Shipping and delivery.
2. Next to the shipping profile where you want to add a shipping rate, click Manage.
3. Next to the zone where you want to add a rate, click Add rate.
4. Select Use carrier or app to calculate rates.
5. In the drop-down menu, choose the shipping service that you want to add calculated rates for.
6. In the SERVICES section, select the shipping methods from that shipping service that you want to provide as options for your customers at checkout.
7. 

Click Done, and then click Save.

I hope it helps.