AFAIK, the only way to do this would be to merge the POI files - thats OK if you have tomtom files but not sure how you would go about doing it for the BMW in-built ones unless you replaced them with one of the freely available POI's at pocketGPSworld etc.
What's needed is a 'decompiler' for the BMW format POI's that turns them into ASC or OV2 format
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