You have to check what are the available export options first to see if you can save the data to Excel or CSV, because Tally ERP allows you to add the data from Excel files. If your can't export to Excel or CSV, check the built-in Help section to see exactly what is the process to save the data for Tally ERP compatibility.
I suggest you contact Tally to explain the situation, because it's possible they might have the tools to convert the data for their system.