Unfortunately, Google does not provide a way to recover a deleted assignment (also known as Coursework). We hope some day they'll add that capability, but at the time of this writing, they have not.

So, if you've deleted the assignment in Google Classroom, there's no way for TeacherMade to recreate it. You will have to create a new assignment. If your students had completed work on that assignment, those submissions will still stored in TeacherMade under the old assignment, but TeacherMade has no way to send scores to the deleted assignment in Google Classroom. So, you will have to manually enter those scores into the new Classwork created for your new assignments.

We're sorry for the inconvenience this might cause. You can use this procedure to request that Google add a deleted assignment recovery feature: https://support.google.com/edu/classroom/answer/10011324.