Put into bat, Himachal Pradesh piled up a big total of 308 for seven and then bundled out Bengal for 219 off 36.3 overs at Madhavrao Scindia Cricket Ground.
Chopra and Bist added 157 runs for the second wicket after Himachal lost opener A K Bias (3) early and then Dogra struck 78 off just 48 balls with two fours and six sixes to take the score past 300.
For Bengal Ashok Dinda and Sayan Ghosh took three wickets each for 69 and 67 runs respectively.
Chasing a stiff target, Bengal struggled all through as they slipped to 20 for 2 inside the fourth over. Openers Srivats Goswami (13) and Sayan Mondal (4) departed cheaply.
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Sudip Chaterjee (33) and skipper Manoj Tiwary (36) then tried to steady the Bengal innings with a 65-run third-wicket stand, but both of them fell in a collapse that saw Bengal lose five wickets for 17 runs. Bengal were 102 for 7 at that stage.
For Himachal, Pankaj Jaiswal grabbed three wickets for 28 while Bipul Sharma finished with figures of 2 for 39.
Brief Scores:
Himachal Pradesh: 308 for 7 off 50 overs (Prashant Chopra 91, Robin Bist 84, Paras Dogra 78; Ashok Dinda 3/69, Sayan Mondal 3/67)
Bengal: 219 all out off 36.