In the 2nd step of GSTR 2A reconciliation, you may upload your Purchase Register directly into GSTZen using Tally or Excel format. For uploading through Excel, the user can upload the data using their own template or they can use the template (Sample 1 or Sample 2) provided by GSTZen.
Under Format 1, the line items are listed one below the other (Consequetive rows in the Excel) whereas in Format 2, the line items are present in the same row.
Alternatively, you may also upload Purchase Invoices through Tally. Please refer the article – Seamless Tally Integration