This question is in reference to Atlassian Documentation: Customize your site
Yes, you can, make sure the "timetracking" field is available in the screens and field configurations for the sub-task issue types.
But bear in mind that they don't roll up a lot - Agile almost certainly won't handle them the way you think it will.
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.