# Create Piggyback Roof Truss Type From Model Lines

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

![](https://239424168-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FqtUsszuAWXIZhQhrvjnb%2Fuploads%2FidHKY5wM0LCmawHJfMxf%2F0.jpeg?alt=media)

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

![](https://239424168-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FqtUsszuAWXIZhQhrvjnb%2Fuploads%2FMqPIHQX7zktuNJv4LQUZ%2F1.jpeg?alt=media)

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

![](https://239424168-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FqtUsszuAWXIZhQhrvjnb%2Fuploads%2F2RXdIdKDJaXrnEh1NJez%2F2.jpeg?alt=media)

* Select Model line and run **Create Section View by Model Line**
* Set **Roof Cutting Leve**l to **None**
* Draw new model line for piggyback truss

![](https://239424168-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FqtUsszuAWXIZhQhrvjnb%2Fuploads%2FazfK97QP0qqUl6bIQRm6%2F3.jpeg?alt=media)

* Select a model line and run **Create Piggyback Roof Truss Type from Model Lines**
* Use **Truss Builder** to design new truss - select **OK**

![](https://239424168-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FqtUsszuAWXIZhQhrvjnb%2Fuploads%2Fubr1lk7eZyuRkxW5XZ8f%2F4.jpeg?alt=media)

* 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

![](https://239424168-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FqtUsszuAWXIZhQhrvjnb%2Fuploads%2Fz6drZfPibWH6JWR42ye3%2F5.png?alt=media)