Thanks to earlier tips, in particular to Himeno, I finally got an ex Khartoum LONE4 (excludes Africa and North America) to work on the online site. However taxes are enormous probably because of a couple of BA flights?

Itinerary:
Khartoum-Amman (RJ)-Barcelona(RJ)-Madrid (IB)-RIO(IB)-Santiego(Lan)-Sydney(QF)- Auckland (QF)-Brisbane (QF)-Darwin(QF)-Perth(QF)-HK(CX)-BKK(CX)-HK(RJ)-DEL(CX)-LON(BA)-DXB (BA)
* Lon-Dxb leaves the same day as arrival from DEL so the London tax should be avoided.

Of the $1966 - $894 is "Airline Fuel Surcharge", $277 "Multiple Surcharges" SDEM -$129, Australia Passenger movement charge $115, Australian Passenger Service charge $94.

Also any tips on improving the itinerary to make better use of segments welcomed as well as reducing the taxes.

Finally, I thought that the 7 day advance booking requirement was only if the trip started in US? The online planner wont let me book anything departing earlier than 28th.

Thanks for your help.