arcgis desktop - Importing values into n:m relationship class of geodatabase?

I have an m:n relationship class in an ArcGIS 10.0 Geodatabase.

The values for the association table already exist in another table.

I would now like to import this table into the ArcGIS Relationship class instead of having to edit the table manually.

I don´t however see an import function.

Is there a way to import the values without manually editing the table?