If the cart contains any one of the selected products along with other products that should be applied handling fees and cart contains only the selected products no need to apply handling fees.
Here I am using Extra fees module
Using the shopping cart price rule,
Here how to add a condition like if a customer tries to add other products to the cart but cart have already selected products then should be applied to handling fees.
Now, if more than one special products (all special listed in https://i.stack.imgur.com/MRGD9.png ) exist in cart handling charge applied, i need this for other products.
How to do that? thanks