2b already generated on 14 .2.2023 , in gstr 3b purchase return showing table can change from january 2023. if itc not autopopulating we can't understand the new method.
If your ITC is not auto populating, You can manually compute input GST (IGST + CGST + SGST) in a excel sheet as per your GSTR2-A and put those details in field of eligible ITC.