Form for opening RD account - http://www.indiapost.gov.in/pdfForms/SB-103(a).pdf
Application Form for automatic transfer from PO Savings Account to RD Account(s) - http://www.indiapost.gov.in/pdfForms...FromSBtoRD.pdf
More Info - http://www.indiapost.gov.in/POSBActs/PORDRules1981.pdf