How do to

 we   missing some  sales amount ( 1,00,000) in GST R3B in the Month of Aug  2017 (  GSTR 3B  filling Date 20/09/2017) but  missing sales bill  add that month  GSTR 1  return ( GSTR 1 filling Date 31/01/2018) , input balance carry forward next month ,  we not paid taxfor missing sales amount  and not adjusted in ITC, now we will do adjust in itc of this month (or) we will pay  tax direct without any notice