You use the options of the Dimension Definition tab to set or change the properties of standard and attribute dimensions:
Outline—Displays a list of the dimensions of the associated outline. To change properties for a standard dimension, you right-click the dimension, and select Edit Properties. To define an attribute dimension, you right-click its base dimension, and select Edit Properties.
Rules file—Displays a list of the standard dimensions that are defined in the rules file. To create a dimension, you select the Rules file option, enter the dimension name in the Dimensions text box, and press Enter. (For naming restrictions, see the Oracle Essbase Database Administrator's Guide). Then, in the Dimension node, you can right-click the dimension and set its properties.
You click the Outline button to associate the rules file with an outline and to populate the dimension node.
“Setting Dimension and Member Properties” in the Oracle Essbase Database Administrator's Guide
“Using the Data Source to Set Member Properties” in the Oracle Essbase Database Administrator's Guide