Charting Query Total results in WAD

Hello, I have a question regarding charting only the results in WAD. Currently, I have a % Lot Acceptance Calculated Key figure and in my Rows "Vendor" Upon executing, I get each individual Vendor counts which fall in the % Lot Acceptance bucket. I then retrieve the results, summed up view but when I chart this in WAD, I do not want any low level results but only the rolled up results. Any suggestions on what approach I should take? Should I possibly be pre-calculating the % Lot Acceptance in the Update rules and create a new field % Lot Acceptance which holds the "resulted" value? Should I utilize Virtual Characteristics/Key Figures? Thanks for your help in advance.