Dear Saurabh, please refer CBIC circular no. 26/26/2017-GST wherein they have clearly mentioned that in case liability is under reported in a month and GSTR- 3B has been filed .Then such liability may be added to GSTR-3B of subsequent month and furhert if such liability are not reported in GSTR-1 of the month then may be reported in GSTR-1 of corresponding month where liability has been added GSTR-3B.
Saurabh in your case you have not reported the invoices in the previous returns and consequently has not paid related liabilities. in such case add such liability in GSTR-3B of subsequent month after payment of interest and declared such invoices in GSTR-1in which payment is made.