Pardon me if this is a noob question.

I'm trying to get from TPE-GRR around 12/21 to 1/2 to visit the family for Christmas. I know that CO doesn't fly to TPE but there are still some fares listed.

For instance, take SLXUR which routes:

SPECIFIED ROUTE: 0031
YY - MEANS TRAVEL VIA ANY PARTICIPATING CARRIER\'S NONSTOP OR
DIRECT SERVICE
TPE-GUM-HNL-LAX-EWR-CLE-GRR
TPE(YY)HKG/TYO/BJS/SHA-EWR-HOU-CLE-GRR
TPE(YY)SEL(YY)HKG/TYO/BJS/SHA-EWR-HOU-CLE-GRR
TPE(YY)TYO/HKG/BJS/SHA-GUM-HNL-HOU-EWR-CLE-GRR
TPE(YY)SEL(YY)TYO/HKG/BJS/SHA-GUM-HNL-LAX-EWR-CLE-GRR
TPE(YY)HKG/TYO-GUM-HNL-HOU-EWR-CLE-GRR


So first of all, how would you go about constructing an itinerary for this fare? Is it even possible? And how does this YY business work?

Maybe it's just easier to take a LCC to Hong Kong. Anyway, I'm curious to see if anyone has any advice.

Thanks!