if u want to travel from bsp,apr,sdl,umr etc. to nzm, then book from byt and change the boarding point to above stations,it has two advantages
1.your quota will be general so chances of confirmation is more.
2.the chart will be prepared on previous night so it gives you enough time,unlike u book from given stations where chart is prepared on day of journey from bilaspur.
i...
more... have done that while travelling from apr to nzm.boarded from apr
and booked from byt. cost 50 bucks per head extra in sleeper class.
source-
/blog/post/1014092