Yes, you can add any bank account in UPI. The bank should be enabled on UPI i.e. bank should be UPI member bank.
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What is a UPI ID?
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Who can use UPI on Freecharge?
What is Freecharge UPI?
What can be a UPI ID?
Does the UPI ID necessarily have to end with @freecharge?
What can you do using Freecharge UPI?
Are there any charges to use UPI on Freecharge?
What if someone has already created a UPI ID using my name?
Is UPI available on Freecharge app on iOS, Windows and Blackberry smartphones?
Can I add my other bank accounts to UPI ID?
Yes, you can add any bank account in UPI. The bank should be enabled on UPI i.e. bank should be UPI member bank.