I don't know if you still need help, but I think here http://resources.esri.com/help/9.3/arcgisdesktop/com/samples/Cartography/Representations/26ADCF02-6E0D-41E9-B939-0FE417926643.htm is better sample how to add layer with representation symbology. If you need more help, send an e-mail to manni.m@seznam.cz
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