Can you use multiple flight credits on a single itinerary?

[Lynda2475]

I have 2 QF flight credits valued at $298 and $149 respectively, now that the borders are opening if I want to book a return flight valued at $519 can I apply both credits to that one new booking?

Online if I click redeem i seem to only be able to use one.

 

[RichardMEL]

Apparently you can get this done via a phone agent. You cannot online.