Useful post on Norm’s PerformancePoint Server Blog showing a short video on how to do intercompany eliminations in PerformancePoint.
The video is actually by Forrest Dermid, who sets the scene by explaining why you would actually want to do an intercompany elimination. He then goes on to show the relevant areas of Planning Business Modeler, demonstrating in detail the changes that you need to make to your account dimension and model properties, amongst others.
Really worth watching in my opinion. You can find it here.