When I called the first time I started with the itinerary change, making AGP-MAD a surface sector and dropping HEL. When the agent for some inexplicable reason couldn't see D availability MAD-DOH, I asked if she could restore original booking. She said until I completed the new routing nothing changes. We hung up with my original flights still in place. I would have taken Mwenenzi's advice but in the interim I'd called back to see if I could book a codeshare showing D on QR, or the IB flight. Fortunately, the new agent was able to book my desired changes. Otherwise, had I not been able to complete a new routing, I would have been a no show and I guess forfeited my remaining ticket. The good news is I got it done. The even better news is that Expert Flyer is still working!