Create Piggyback Roof Truss Type From Model Lines

Draw a model line and set roof cutoff level to desired height

Select a model line and run Create Roof Truss Type from Model Lines

Name new truss type - select OK and wait for truss to be generated

Select Model line and run Create Section View by Model Line

Set Roof Cutting Level to None

Draw new model line for piggyback truss

Select a model line and run Create Piggyback Roof Truss Type from Model Lines

Use Truss Builder to design new truss - select OK

Select Group, write new truss family name and fill values of other parameters

New truss will be created in the place of model line. Section view will be automatically deleted

Edit type parameter of a new created piggy back truss - Truss Offset