how to create gst summary, gstr-1,gstr-2,gstr-3 report in .slsx file for for india gst return
You have asked a question with no details. Manager will not create any tax filing for you, no matter what country. And it does not create export files; it allows data to be copied from screens and pasted into word processing or spreadsheet programs in TSV format. See this Guide: Manager Cloud.
Have you looked at the Tax Summary and Tax Transactions reports?