neither duronto nor rajdhani qualifies for telescopic. you need to book two separate tickets. to get telescopic for dhanbad you need to book in~
1 ypr hwh express from ypr to hwh in class 3a/2a and then hwh dhn dd in cc
2 ypr hwh express from ypr to hwh in class sl/3a/2a and then in hwh ndls poorva express in class sl/3a/2a.(pls note only 3 days a week poorva runs via dhn gaya)