How to Enable create subtask option in the issue?

[Vishnu Vardhan Chenna]

Hi

I was created 5 Deferent issues I seen some 3 issues have create subtask option remaining tasks I didn't find any create sub-task in these 2 issues.

how to enable this in remaining issues. 

[Dave Mathijs]

Hi @Vishnu Vardhan Chenna 

Do you mean that for the same base/standard issue type in a project, some issues allow you to create sub-tasks and others don't?

[Dave Mathijs]

If a/the sub-task issue type has been added to the issue type scheme associated with the project, you should always be able to create a sub-task for any of the base/standard issue types in the project.

[Nic Brough -Adaptavist-]

You also need the permission to create issues in the project.  But it is usually what Dave says - there are no sub-task types configured for the project, or your issue already is a sub-task.