Assigning partial credit in multipart questions is closely related to establishing point values for the individual parts during construction of the question in the Question Bank Editor. As you build a multipart question in the Question Bank Editor, you can assign a question weight to each part of the question. In this way, you control partial credit in multipart questions.
See Also:
Multipart Questions in the Question Bank Editor
Working with Multipart Questions
Partial Credit in Multipart Questions