> 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/use-cases/editing-line-segment-properties-pid/inserting-symbols-pid/understanding-assigning-pipe-spec-data-pid/remove-assigned-pipe-spec-data.md).

# Remove Assigned Pipe Spec Data

This chapter describes how you can remove a assigned Pipe Spec Data for a single symbol.

Let's use this example where we have a valve including flanges and fasteners. The handling of flanges and fasteners is explained under [Understanding AutoPipe (P\&ID)](/plant-tools/plantspecdriven/how-to-use/use-cases/editing-line-segment-properties-pid/inserting-symbols-pid/understanding-autopipe-pid.md) and [Understanding Fasteners (P\&ID)](/plant-tools/plantspecdriven/how-to-use/use-cases/editing-line-segment-properties-pid/inserting-symbols-pid/understanding-fasteners-pid.md).

![](/files/DZFWUmo10Jzfs9DwrQBo)

To remove the assigned Pipe Spec Data you select **Assign Catalog Data** from the context menu.

![](/files/u0EDJQYJsGkInOFQahmt)

In the **Part Selection** dialog you simply click on **Remove catalog data**.

![](/files/YUS32NSPTRxogNJUl5wQ)

Now you see the icon indicating that no Pipe Spec Data are assigned anymore to this valve. You also see, that the **Long Description (Size)** is not shown in the tree (this depends on your [Tree Settings](/plant-tools/plantspecdriven/how-to-use/configuration/tree-settings.md)). And since no Pipe Spec Data are assigned, PlantSpecDriven doesn't know what End Types are used and therefore removes the flanges with their fasteners.

![](/files/S5op7DV259sU50KiwBre)

You can filter the Structure Tree for nodes with no assigned Pipe Spec Data (see [Filtering by Pipe Spec Status (P\&ID)](/plant-tools/plantspecdriven/how-to-use/use-cases/understanding-the-structure-tree-pid/filtering-by-pipe-spec-status-pid.md)).