In Euna Procurement, there is no need for you to withdraw an incomplete Submission.
To ensure that your Submission is not visible to the Project Owner on the close date of the Project, you can leave the Submission in Work-in-Progress Status.
If you have already clicked to Submit and Finalize your Submission, you can return it to the Work-in-Progress status by following the instructions to un-submit.
If you would like to switch your Intent to Bid to a No Bid, you can do so by following the instructions in the link above, as long as the due date has not passed.