Topological dimensions are normally used in the creation of Topological Design Components. The tool is only available if the current layer consists of a Standard design.
Settings
From the pulldown list choose the required Dimension Settings. You can add these settings to your favourites 
or use the edit button 
to make a local override.
Name
Enter a unique name for this dimension.
Mode
From the pulldown list choose either Automatic detection or Single entity.
Help
Enter an optional help message to be displayed when placing the associated Design Component.
Allow part mirroring
Switch this option on to allow the Design Component to be mirrored when it is being placed.
Indicator size
Enter the required size of the topological dimension indicator.