Mastery Manager has a feature called gradebook paste that allows teachers to paste grades into PowerTeacher Pro.  To access directions on how to use gradebook paste, log in to Mastery Manager and then click on the link below:

Gradebook Paste Instructions

Note: The instructions say to press F8 when pasting grades into the gradebook.  Depending on individual settings, some users need to press fn + F8 for the paste feature to work properly.