Here is an easy workflow in Wiseflow.
1) Export the hand ins
First build a package, and export everything as a package:
2) Evaluate the work
Now you can evaluate the hand ins in a suitable manner. Among the files you'll se a spreadsheet for grades.
3) Import the grades
When the evaluation is over, you can import the grades from the spreadshet in this window. Below you'd normally see the names of all the students in the class, for obvious reasons these details are removed: