Hi

i am not able to create sub tasks in SharePoint 2013

if i create a new view with some filters i am not able to create subtasks.

any idea on how to overcome

Refer this, there should be an option:

http://sharepoint.rackspace.com/sharepoint-2013-how-to-create-a-subtask

http://community.bamboosolutions.com/blogs/sharepoint-2013/archive/2013/08/09/how-to-create-subtasks-and-multi-level-task-lists-in-sharepoint-2013.aspx

i need to add subtasks if i add any filters in the view

the post which you shows is how to add subtasks.