You can register the vehicle online in Puducherry .Visit the official transport site for puducherry for registration.
click on the below image application for registration and tax payment online
Puducherry vehicle regi - http://transport.puducherry.gov.in/html/vregn.HTML
Puducherry driving license - http://transport.puducherry.gov.in/html/dllr.htm
Puducherry vehicle tax payment online - http://transport.puducherry.gov.in/html/under.htm
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