Set prefered Shipping costs

[Valmiki108]

Hello,

I have a problem with shipping and carriers. I hope that someone can help.

I have 3 carriers set with 3 different settings:
Carrier 1: price 8€, free shipping above 49€
Carrier 2: price 8€, free shipping above 99€
Carrier 3: price 10€, free shipping above 99€

Carrier 1 is forced only for a 1st group of products
Carrier 2 is the general available carrier
Carrier 3 is forced only for a 2nd group of products

When, in the cart I have products from the 3 differnt groups the shipping prices are summed together and free shipping is met only when all groups have enough products to meet the 2 different free shipping prices 49 and 99€.

But what I need is that the "highest" Carrier is chosen when products from the different groups are in the cart:
that is chosen Carrier 2 if in the cart there are groups 1 or 2
that is chosen Carrier 3 if in the cart there are groups  1, 2 or 3
obviuosly that Carrier 1 is chosen if in the cart there is only group 1.

I hope that I explained myself clearly enough.

Thank you in advance,
Valmiki

[Valmiki108]

Ok, nevermind! After several trials and much thinking, I found a solution that works very well.

Since it is a bit complicated and long to write, if anybody is interested in my solution, please let me know.