> For the complete documentation index, see [llms.txt](https://help.auxalia.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.auxalia.com/plant-tools/plantspecdriven/how-to-use/configuration/relationships.md).

# Relationships

This chapter is required only if you want to use Fasteners (e.g. Gaskets). Fasteners will be related to a Flanges (or other end connecting symbols) or other Inline Assets/Instruments.

Here is an example on how this can look like in the [Using Structure Tree](/plant-tools/plantspecdriven/how-to-use/use-cases/routing-pid-line-segments-3d.md) chapter.

![](/files/RhgUtVZ6GrXftn8A0yn1)

In order to be able to create the relationship between Inline Assets and Fasteners you first need to configure PlantSpecDriven with [The Wizard](/plant-tools/plantspecdriven/how-to-use/configuration/the-wizard.md) otherwise you cannot open the Structure Tree palette.

After you have configured PlantSpecDriven the [Using Structure Tree](/plant-tools/plantspecdriven/how-to-use/use-cases/routing-pid-line-segments-3d.md) is automatically opened. If this is not the case, you can open the [Using Structure Tree](/plant-tools/plantspecdriven/how-to-use/use-cases/routing-pid-line-segments-3d.md) by clicking on the toggle button in the ribbon of PlantSpecDriven.

![](/files/RKMKHHpD4twMIgBCneuc)

In the Structure Tree palette you expand the menu in the upper right hand corner and click on **Edit Relationship Types**.

![](/files/v5VfNaApzKIbuVGm23N4)

This opens the **Relationship types** dialog where you can add additional relationships. Here you click on **New\...**.

![](/files/F1f4P317mmrzJXWkuRNn)

Now you select **Inline Assets** on the left and **PSD\_Fasteners** (or whatever class name you choose) on the right.

Remark: The reason for selecting Inline Assets and not Hand Valves is, that the Fasteners will later be related to a Hand Valve, or a Piping Fitting (this is where our Flanges are), or a Piping Specialty Item. By using Inline Assets we have the highest flexibility. Otherwise we would need to create multiple Relationship types.

![](/files/aNbfXu7VPgp7nFl8b01W)

After clicking on OK we see the new Relationship type in the dialog.

![](/files/GjMXE9oWYzfgqRbHPvJ4)

If you use also symbols from the Inline Instruments class you need a second relationship type.

![](/files/aaHLHzSYjtIqx0Yacb8r)

This time between the **Inline Instruments** class and again the **PSD\_Fasteners** class.

![](/files/DFUSliNSEvZFfiSSV8T8)

If you are done you click **OK**.