The match ended in a tie, with Reliance One tying with their rivals' total of 168-7, leading to the Super Over tie-break that DY Patil 'B' won by chasing down 13 runs needed for victory to make the last four.
In the other quarter-finals, Central Railways halted Mumbai Customs' run, winning by 75 runs, CAG beat D Y Patil 'A' by eight runs and BPCL got the better of State Bank of Hyderabad by eight wickets.
The final will be held on the same day.
Brief scores:
D Y Patil 'B' 168-7 in 20 overs (Shivam Dubey 51, Shashank Singh 48; Babasaf Khan Pathan 2-18, Krunal Pandya 2-28) tied with Reliance One 168-7 in 20 overs (Nikhil Naik 52, Axar Patel 39; Prateek Dabholkar 2-17, Manjit Chowdhary 2-34). DY Patil 'B' won in the Super Over.
Central Railway 164-6 in 20 overs (Saanket Bhaye 50, Pravin Deshetti 39; Akash Parkar 2-41) beat Mumbai Customs 89 in 14.4 overs (Asad Pathan 34, Vidyadhar Kamath 4-18; Santosh Saxena 2-15) by 75 runs.
CAG 165-6 in 20 overs (Biplab Samantray 59, Ankit Kaushik 43, Ankit Sharma 32 not out; Shubham Ranjane 2-23) beat D Y Patil 'A' 156-6 in 20 overs (Kedar Jadhav 41 not out, Yogesh Takawale 36, Sarfaraz Khan 31; Biplab Samantaray 2-32, Gurinder Singh 2-34) by 9 runs.
