This configuration is dwg based, as the Dimension Style Manager is a CAD functionallity. To make a permanent configuration which will be used in newely created drawings, you need to make this Dim. style modification in the Advance Steel prototype used to create the drawing.
The prototypes are present in : C:\ProgramData\Graitec\Advance Steel\2013\Shared\Support\Prototypes\
You can edit them with Advance Steel + CAD platform.