As far as i know (if the system has not changed) you will have to wait 4 weeks without updating your beatmap via BSS, then it will be moved in Graveyard.
On your profile-page, under Beatmaps-tab, you can manage your beatmaps and resurrect/delete them.
Though if you ask me: if it is not finished, instead of deleting just "Update/Submit" it again but this time click "work-in-progress" button, so it will be okay there.