> 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/pipe-spec/symbol-substitution.md).

# Symbol Substitution

If you want PlantSpecDriven to be able to substitute the P\&ID Symbol after you assigned catalog data, you must add an additional property to the Catalog/Pipe Spec. As an example we use **PSD\_PIDSymbolName**. But again, you can choose any name you like. Again, make sure, that you select **All Part Classes** and **Part Family** is selected.

![](/files/XIMDxHPvpMJY7PFgPSzS)

You then type in the name of the P\&ID Symbol.

![](/files/lFlLyxRJfNswnPxGSYWB)

You must use the exact name of the Symbol from Project Setup. Don't use the block name.

![](/files/fNHWOROuiH07WNITAjId)

If you now insert for example a general valve...

![](/files/mm4SHRRnaRdIqCCcZcdc)

... you see the choices in the **Part Selection** dialog (the column may also be suppressed, but then it will work also).

![](/files/FaBJiRqo2apqKjsCMPoU)

When you clicked on **Assign Catalog Data** the General Valve Symbol will be substitutes with the valve Symbol you selected. For example a Butterfly Valve.

![](/files/JJqr2YVGchGHNXjpNrte)