In the Project Management task, select the Catalog and then select Tools > Update Custom Symbol Configuration. This updates "CustomSymbolConfig.xml" with the ProgID of the new assembly and its location relative to the "%OLE_SERVER%" path.
In the Project Management task, select the Catalog and then select Tools > Update Custom Symbol Configuration. This updates "CustomSymbolConfig.xml" with the ProgID of the new assembly and its location relative to the "%OLE_SERVER%" path.