Dimensions establish the business context and represent the aspects of a client's business relevant to a trading program.
For almost every mechanism you select in Trading Programs, you will be required to assign at least one item from each of your dimensions to the program line you are creating.
This setting is simply labelled Dimensions and will require you to first select a dimension collection and then to click on either a Select all items option or a Manually select items option.
Included dimensions determine what entities should earn rebate (e.g. which products, product groups or product categories are earning the rebate specified in a given program line).
Click here to read more about dimensions.