I've looked at booking via KLM.com ABZ-AMS-OPO return. The price is ok, but it won't give me a price for baggage, just says payable at the airport....

I've got enough miles to break it up and save.
ABZ-AMS-ABZ KLM flying blue
AMS-OPO-AMS Transavia paid

Return connection time is 1.5hrs. Can i internline bas OPO-AMS-ABZ?

thanks in advance