Who is asking you for a control number? If you Efiled and your return was Accepted, you shouldn't be asked to any more info.
Was your Efile Rejected because you imported a W-2 without a Control Number?
If you can clarify your issue, we'll try to help.
Here's more info on W-2 Control Numbers that may help you.
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"