To import all styles from one drawing or template to another in 2010, simple create a new point style. Select the marker tab, check Use AutoCAD BLOCK symbol for marker, right click in block area and select browse. Set dwt or dwg at the bottom and select source. Click ok and all styles are imported to the drawing. The only difference is this does not override existing styles that already exist in the drawing.
Found at http://civil3dguru.blogspot.com/2010/06/undocumented-aec-style-commands-civil.html