Change field is there to provide the necessary value changes for all categories and subcategories. The data column must provide actual change value for each category (for example, +3K, - 25K).

Change field is mandatory. Visual can’t be render without it.

If a cell is left empty in the column, that is used for the Change field, it will be considered as a total/subtotal, which will be automatically calculated and drawn if the Sub Total Mode setting has been set to "All" (example below)