The HFMwCustom1 component contains the dimension property. This component enables you to work with the Custom 1 dimension.
Obtaining an HFMwCustom1 Object Reference
HFMwCustom1 object references are returned by the custom1 property of the HFMwMetadata component. After obtaining an HFMwCustom1 object reference, you can then use the dimension property to initialize the HFMwDimension component to the Custom 1 dimension.