Problem with different shipping options

[kokod]

I have 3 different shipping options on my shop:

Post - €1.00 for small packages - type A

Courier - €5.95 for bigger packages - type B

Collect from studio - Free

If a customer buys only type A products, they can choose Post or Collect from studio, similarly if they buy type B products, they can choose Courier or Collect from studio. However if they try to buy type A and B products, they can only Collect from studio.

Is there any way to set up the shipping so that even with type A products in the basket, if there is a type B product, the options will be courier or collect from studio?

I'm using version 1.6.1.19

Thanks very much,

Karen

www.kokodesigns.ie