Set-up 2 ways of shipping- tracked and untracked- possible?

Hi,

I would like my customers to be able to choose whether they want an order to be tracked or untracked for international shipping. There is a price difference in the two options.

It seems I can only set-up one, although in the lanugauge settings - Checkout and systems- there are field under the header: Checkout shipping other method.

I would like to be able to set that up so a customer can choose!

I have the POSTNL app installed to use for shipment.

Regards,

Joyce