@ Pankaj., What is your exact Registration..? It's regular scheme you ll be file nil return for GSTR 3B, GSTR 1, GSTR 2 and GSTR 3... If under Composition scheme then you ll be file GSTR 4 in October....
@ M Agarwal., As per rule it's available. But, Some assessee told it is not supported. So, You ll try to it in GSTR 1 then you can show it in GSTR 3B...