Add fixed rates for each product?

Hello,
I have some requirement about shipping rules setting, could you please help me figure out is it possible to setup through this plugin?
  1. We Sold different manufactures goods, they will dispatch product independent, so i need to calculate shipping fee  by manufacture. When user buy manufacture A AND B together, we need a rule to surcharge by fix fee. Not surcharge by percent.

   2. what's the definition of order SubTotal ?
       if i set the requirement group :
        manufacturer=A   AND order subtotal>1500 AND order subtotal<3000
       does that mean the rule will affect only when user buy manufacturer A's product and the sum of A's price between 1500~3000?

Yes
You can try trial version.

1. Create the shipping rule 1 for manufacturer A and set "Rate Surcharge"  25$. Configure Action "Go to next step".
2. Create the shipping rule 2 for manufacturer B and set "Rate Surcharge"  10$. Configure Action "Go to next step".

Customer added two products from manufacturer A and one product from manufacturer B in his shopping cart.

Nopcommerce calculates shipping fee for all products, ex 33.12$
Plugin will add 25$  (shipping rule 1)
Plugin will add 10$  (shipping rule 2)
Total shipping fee 33.12+25+10


Plugin will add 25$  (shipping rule 1)

Yes THANKS for the reply,

But the trial setting can only use surcharge by percent.
Can it be surcharged by fix rate?

I did the new release 1.11.
I added the new two types : Discount Fixed and Surcharge Fixed.

Download the new release and try it.
Write me about result.