Match all purchase bill parties wise as you have and match parties wise through GSTr2A and invoice no. are also mention in GSTr2A soo if any missing Invoice, check and so on
You can simply download or if the data is less view the GSTR2A online match the same with your purchase data to check if any particular vendor bill is missing.
Dear Sonam Gambhir... Cleartax gst software (website) is a good option for u to match gstr 2a with purchase register. it has option to import books data and matches it with auto populated gstr 2a which it generates itself. its free for first month and u can use it without any restrictions. note: i am not a seller agent of clear tax . i have no connection with clear tax and i m not promoting the same. I am telling u this because matching each and every bill by urself is very difficult .. So please do tell me if face any problem ..