I have purchased Honda City GXi 2005 Sept 2005 model under Pen Raigarh RTO MH 06 Now my re-registration is due on 22.09.2020 what is the Grace period for me to do re-registration of the same Vehicle and how much are re-registration charges to ne paid on MH 06 RTO Bank. Can I make an electronic transfer from my bank to their RTO MH 06 official Bank Ac

You need to get it renewed at MH RTO. 

No grace period. But due to Kovid you can renew it before 31/12/2020 without fine