I am currently tracking machine production daily and comparing that to a fixed goal as a percentage of completion. Since I have four different machines, I stored each of the goals in a table which ties a machine to its particular goal. For each date, I have a report that will show the daily percentage of the target goal. This is working fine. I want to add a feature that will group a set of dates together, by some set time period, and will then total the production. When I try and use the fixed goal to measure the performance of the totals, I get an error message. Is there a way I can get this figure to work in this application?