Merger company

Anshuman Basu (account -GST) (1556 Points)

25 February 2021  
during FY 19-20 M/s A having turnover 3 cr merger to m/s B whose turnover 3cr.
merger tribunal date is 01/01/2020 but effect from 01/4/19.
m/s A does not make balance sheet.
M/s B make balance sheet and turnover show 3+3 =6cr
now question is how we shoe GSTR9 and 9c
please answer no one can answer properly