Originally Posted by
goingplacestogether
Currently, our travel vouchers are available for redemption via our contact centers or local offices. However, the option to redeem your voucher via our website
https://www.qatarairways.com/en/homepage.html will be available soon.

Great, but I am yet to determine pricing for a multi-city itinerary due to:

Since I don't know which one of 7 available, I tried each one. To do this the flight selection process has to start from the absolute beginning of the booking.
Finally found that all 7 failed, yielding:

Took 30 minutes.