Susan,
I realize it is a bit late as it is nearing the end of August, but PGGP is an elementary grade book and the new version, (5) adds standards-based grading to the traditional features.
There are a number of grade books that are standards-based and it is probably easier to use one of them rather than trying to tweak you existing grade book. I say that because for several years I have heard from PGGP users who were "tweaking" the grade book.
You can read more about PGGP and http://www.pggp.com
Best Wishes in your search.
George
Gradebook
Standardsbased grading
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