Creating a Custom Attribute 
1. Go to InfoObject maintenance in BW (in the SAP menu choose Modeling ® Object Maintenance ® InfoObject).
2. Select the InfoObject for which you want to add the attribute, and choose Maintain.
3.
To create the
attribute, follow the procedure described in section
Tab Page: Attributes.
The new attribute is displayed in the workbench at Master Data ® Custom Attributes.
...
1. In the workbench, choose Master Data ® Custom Attributes.
2. Double-click on the attribute you created.
3. To create attribute values, choose Create in the lower left-hand area of the workbench screen.
4. Assign a key and a description for each value.
5. Save your entries.
For example, you can use the attribute to more precisely describe consolidation units (in the workbench, choose Master Data ® Consolidation Units ® <the characteristic> ® tab page Other Attributes).
When executing queries, you can select the attribute if it is defined as a navigation attribute.