Bhrigu Express: बलिया की आन बान और शान , भृगु एक्सप्रेस है तुम्हारा नाम। हर रविवार तुमसे मिलना है मेरा काम। - Shanzil Kabir

Its possible .. but .. need visit nearest PRS counter n change before 24 hrs of train departure.
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The request for change of Boarding Point should be submitted at least 24 hours before the scheduled departure of the Train from the station.
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Fill...
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up a reservation form and enter your details and PNR no. with the new boarding station clearly mentioned.
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Approach supervisor at the nearest Railway Reservation Office with with your ticket and the actual id [in original] mentioned therein.
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This facility will be given once only.