I remember a CPE class where the instructor cited a court case (actually multiple) where the IRS denied the tax deduction(s) because each line of the 8283 was not completed for each individual contribution.  Cannot give you citation without research.  Bottom line, you can combine but you run a risk.  Make it an instructional item for taxpayers for the future to not drop off charity weekly  For this year "copy and paste".  Also, in old days we could not efile if more than 5 forms 8283 but that is gone now.