Here is the potential situation: You buy a round-trip ticket from Tokyo to Paris via Beijing, and go to Paris. After spending time in Paris, you want to spend some time in Beijing.
In this case, is it feasible to get on the return flight to Beijing, but instead of returning back to Tokyo, get off at Beijing using the return ticket?
In other words, I want to ditch the return ticket only from Beijing to Tokyo. Surely I know I have to buy another ticket to leave Beijing (and for your information I don't necessarily like to return to Tokyo; maybe next to Seoul or Hong Kong).
If this is possible, what should I do? Is it enough to just notify a staff at check-in counter that I want to get off at Beijing and thus don't want the airline to transfer my check-in baggage?
NOTE: I consider it only on return trip. If you do this in an outbound ticket you will lose the ticket, won't you?