Some items don't affect shipping cost

[papons]

Hi all,

I calculate shipping cost depending on weight.

A pack has free shipping but single items belonging to the pack, pay shipping if sold separately.

If one order is composed by pack (free) and other items (pay) I need to calculate the cost of these single items shipping and made the customer pay it.

 

If I use a cart rule , the entire order is shipping free.

For packs I use Advanced Pack 5 module, that does't let me change the pack weight (it's the sum of single items weights) and the developer doesn't want to custom it.

Any advice, pleace?