You add an externally-created dimension to your pipeline by importing it with Developer Studio.
Once you import the XML file, the dimension appears in the Dimensions view, and Developer Studio has full read-write ownership of the dimension. You can modify any aspects of a dimension and its dimension values as if you created it in Developer Studio.
To import an externally-created dimension:
Note
Unlike the procedure to import an externally-managed taxonomy, you do not need to run a baseline update to import an externally-created dimension.