Chasing 279/8, India B got off to a flying start as openers Ruturaj Gaikwad (58) and Abhimanyu Easwaran (69) forged an 84-run partnership before Gaikwad was dismissed.
For Karnataka, Shreyas Gopal took two wickets for 55 runs.
Earlier, opting to bat, Ravikumar Samarth (107) and middle-order batsmen C.M. Gautam (76) helped Karnataka score 279 in their allotted 20 overs.
Apart from them, Gopal also contributed at the end. Gopal played 22 balls and scored a crucial 38 runs which included four boundaries and one six.
For India B, K. Khaleel Ahmed took three wickets while Umesh Yadav scalped two.
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