i want to create sub task of sub task if it is possible then how many level of sub task we can achieve and how?
As you're talking about subtasks, I guess you mean JIRA. There are no levels of subtasks, you have issues and subtasks and no more layers.
How can i achieve this scenario
Task1
Subtask 1
Sub subtask1
You don't. I already said that sub-tasks don't go any lower.
You could try the Structure add-on which enables it to look like there are more layers, but that's about the only (working) option I've seen.
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