> 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/updating-assigned-data-on-specsize-change.md).

# Updating assigned data on Spec/Size change

This chapter describes how the already assigned Pipe Spec data in a symbol are updated.

Let's start with the following example where we have the check valve in size 100.

![](/files/Xz4OGFfwZ0EDwIABRwU8)

And here we see the data for one of the flanges.

![](/files/a92CAWvn1tOvwpxU3wKG)

When you change spec or size in a symbol (this applies to the flanges and fasteners too), PlantSpecDriven checks if the already assigned **Long Description (Family)** exists in the new spec/size combination as well (see [Page 12 - Assign Catalog - Port Properties](/plant-tools/plantspecdriven/how-to-use/configuration/the-wizard/spec-driven-lines-symbols/page-12-assign-catalog-port-properties.md)).

Notice the Long Description (Family) in the assigned pipe spec data.

![](/files/g9hiLQkqBlBSls5QgdwN)

Now we change the size to 50.

![](/files/CNrZqGb7Nv1q7dR7hk8o)

In the updated data we still see the same **Long Description (Family)**, but the **Long Description (Size)** has been updated.

![](/files/PtFZepPj3QVYFdPNKvM6)