Hi @Vijay Kumar Thank you for posting your question on Microsoft Q&A and for using Azure services.
My understanding is that you are asking how to permit a user to permit a user to insert/update/delete data, but not alter schema in Azure SQL DB.
You could look up INSERT, UPDATE etc. permissions. You just need a user and GRANT INSERT ON SCHEMA:TheSchemaName TO UserX and then test.
Please let me know if that works.