When I add a chart to a dashboard, it prompts me to select a sheet, but not the columns to display in the chart. If I try to select data fields of categorical labels and data that are not next to each other, I get an error. How do I select the data to display and can it be summarized? For example, I have a sheet tracking supplier assessments, which includes all of the measures, as well as an overall score, and I want to produce a chart of the average score by supplier and/or supplier score trend by date and/or factory. I would prefer to be able to select columns for display so that the range of values doesn't need to be updated as new assessments are added.