I have a table that has two fields. Periods and consumptions. Periods has two kind of periods. one period and four periods...and these two types have different consumption. now I want a chart that has cyclic group within this periods field (User being able to select whether one period or four period.). I know that when you have two fields, you just create new group and drop those two fields there. but is there any way to make a cyclic group within the same field values