Steps:
1) Download excel template from the link or
here: https://www.stacos.com/products/index.php?service=39
2) Fill up the details in excel template.
3) Validate details in the excel.
4) Login/Register to your stacos.com account.
5) Click on "Upload e-File" button given on excel.
6) Check uploaded details on stacos.com
7) E-file the return for each assessee.
A step wise ppt: http://www.slideshare.net/skorydov/bulk-itr1-filing #zip