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.
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.
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.
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.