In preparation for the bracing we change the view to left view.
Now we need two construction lines. Open the dialog.
Following setting:
We need one line on top and one at the bottom with a distance of 300 mm. Start with the button, click the lower line of the view frame and then any point above the line. The construction line should appear. Same on top. One advantage of this dialog is that regarding the setting -Insert in current XY plane the line will be created in the current coordinate system which is essential for the bracing.
At last we need a line between following corner points of the construction lines.
Preparation finnished we can start the dynamic bracing
following settings:
Now we are finnished with roof and bracing. Changing the view back to Isometric View 1 it should look like this: