Yes if you had booked a telescopic ticket you certainly shall have a fare less than two separate tickets...It shall be better to book in same class to have better benefit.
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You can book it at PRS in the same form,like you need to mention
1.Booking from SBC-BLS
2.For...
more... first train SBC to KPD reservation till KPD
3.For Onward journey there is one more column where need to specify from KPD-BLS.