On the Edit tab, click Construction object > Line.
Pick the start point of the construction lineconstruction object that represents a line between two points
Pick the end point of the construction line.
To end the command, press Esc.
To modify the construction line properties, double-click the line in the model.
The line properties are shown in the property panecontrol element in Tekla Structures user interface in the form of a side pane window
The property pane can be used to show and modify the properties of model objects.
Select a color for the line.
Define how far the line extends beyond the picked points.
If you want to make the line magneticgrid and construction object property which enables attaching adaptive model objects so that the attached model objects follow when part of the grid or construction object is moved