differentiate transit times

Hi,

Scenario is as follow:

I have a given customer located in Norway in the middle of the country and I have 2 different carriers providing materials to that given customer - one is a parcel carrier (carrier UPS) and one is a FTL carrier (carrier DHL).

The 2 carriers have different transit times, so how can I SAP-wise reflect that, when the customer is located in one transportation zone at customer master.

And as we can not distinguish our delivery performance is not correct.

Could a solution be to create 2 transportation zone tables in customizing - one for GLS and one for DHL?

Bonus-info: please take into account - my company does not have SAP TM.

In advance thank you

Best regards,

Bo