You can import the multiple subtasks linking to the parent issues, instead of creating.
You don't, natively. You'll need something like script runner or a connect add-on that can issue the multiple calls to do it for you.
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.