[My query is about PNR 4766008709 for train 12715 SACHKHAND EXP]
Yes u can but deduction is there,
Yes you can cancel but now chart has been prepared and your ticket remained in waiting list. So it its e ticket then it will be canceled automatically and refund will be given in 4-7 working days.
If its counter ticket then go to nearest reservation counter and cancel the ticket and receive your refund amount.
You can cancel but you will not get any refund for confirmed Tatkal tickets. But if it is in waiting thrn you are eligible for full refund after deducting clerical charges.