Regarding Assignee button

[Smruti Ranjan Panda]

In the Subtask ,I have an Assign Button ,I want when i click the Assign Button there is a Tab called Assignee and there should be only one option "Assign to me" which is it should be assigned to the user.

I have gone through the workflow and to the transition, and in post validation, i tried to add the issue field.

but for that, there is only Unassigned, Automatic and list of the user.

How do i set to Assign to me

[Jobin Kuruvilla [Adaptavist]]

There is a post function to assign the issue to current user: Assign to Current User

Is that what you are looking for?

[Smruti Ranjan Panda]

Yes ....can i get the post function please

and when a task is assigned to an assignee in the more option i want to have an option called create an subtask .how to add that

[Jobin Kuruvilla [Adaptavist]]

It is a standard post function. You should already have it. Are you not seeing it?

Regarding an option to create subtask, you can't do it by default. Looks for add-ons that creates a subtask on the post function but I am not sure if they do it conditionally or not.