You can create dual dimension tags automatically in all types of drawings. In dual dimensions, you can show dimensions in different units and format above and below the dimension lineline that visualizes the distance between the defined dimension points
Separate dimensions can be combined into a longer dimension line.
Dual dimensions can only be shown in relative and US absolute dimensions, but not in absolute dimensions.
Click On the File menu , click Settings > Options and go to Drawing dimensions settings.
Set the units, format and precision.
Select the drawing types where you want to have the dual dimensions.
When Tekla Structures creates the drawing, it adds in the lower dimension tagpart of a dimension that displays additional information about the building object
in the selected unit and format, and adds the text DIMENSION in the middle dimension tag in the Dimension Properties dialog box.
Below is an example of dual dimensions using the units mm and format ###.