https://help.tallysolutions.com/docs/te9rel64/Data_Management/Import_of_Data_Intro.htm

Importing Data into Tally.ERP 9

You can import data into Tally.ERP 9 in XML format. You can import Masters created in previous versions of Tally.ERP 9 or from third party applications.

The .xml file that is imported must follow the Tally.ERP 9 schema.

Click the following links for more information:

Importing Masters

Importing Vouchers