> 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/plantexpresstools/how-to-use/symbolspalette/usage/create-custom-class.md).
# Create Custom Class
This chapter describes how you can create custom classes.
**Custom Classes** are classes define by the user. You can then later **Custom Objects** like HyperLinks (see [Add Hyperlink](/plant-tools/plantexpresstools/how-to-use/symbolspalette/usage/add-hyperlink.md)) or AutoCAD/AutoLISP commands (see [Add AutoCAD/AutoLISP command](/plant-tools/plantexpresstools/how-to-use/symbolspalette/usage/add-autocadautolisp-command.md)) to the right side of the **SymbolsPalette**.
**Custom Classes** are considered in chapters [Categories](/plant-tools/plantexpresstools/how-to-use/symbolspalette/usage/categories.md) and [Hide/Show Classes & Custom Classes](/plant-tools/plantexpresstools/how-to-use/symbolspalette/usage/hideshow-pidcustom-classes-and-folder-links.md).
Create Custom Classes
Enable **Edit Mode** first (see [Edit Mode)](/plant-tools/plantexpresstools/how-to-use/symbolspalette/usage/edit-mode.md).
To create a **Custom Class** as a root class (at the very top level) you make a right-click below the tree and select **Add**.
This will create a new **Custom Class** with the default name starting with **New Custom Class**.
If you click on the class you can rename it in-place.
Or you use **Edit** from the context menu.
Now you can type in the new name.
After hitting the **Return** key the **Custom Class** will be alphabetically ordered within the existing class structure.
You can also create **Custom Classes** below a custom class by making a right-click on the existing custom class and use **Add**.
You see the new **Custom Class** now below the existing one with the default name.
You can again rename the new class.
Lets add another class.
Again, it is added below the existing class.
And we rename it again.
You can add **Custom Classes** under P\&ID classes as well. Again, you just make a right-click on the P\&ID class and use **Add**.
Now the new **Custom Class** is created below the P\&ID class.
And you can rename it again. And it will be ordered too within the other classes.
At the end of the process disable the **Edit Mode** again (see [Edit Mode)](/plant-tools/plantexpresstools/how-to-use/symbolspalette/usage/edit-mode.md).
Move Custom Classes
Enable **Edit Mode** first (see [Edit Mode)](/plant-tools/plantexpresstools/how-to-use/symbolspalette/usage/edit-mode.md).
As mentioned before, **Custom Classes** will be alphabetically ordered in the same class level of the tree. This means, that you cannot move **Dynamic Blocks** between **Blowers** and **Compressors**.
However, you can move **Custom Classes** to another level in the tree (up or down). Just use Drag & Drop the class to the class under which the **Custom Class** should appear. In the image below the **Dynamic Blocks** class (which is under **Equipment**) should now be under **Engineering Items**.
And now the **Dynamic Blocks** appear under **Engineering Items**.
If you move a **Custom Class** which has sub classes...
...the **Custom Class** and its sub classes will be moved.
At the end of the process disable the **Edit Mode** again (see [Edit Mode)](/plant-tools/plantexpresstools/how-to-use/symbolspalette/usage/edit-mode.md).
Delete Custom Classes
Enable **Edit Mode** first (see [Edit Mode)](/plant-tools/plantexpresstools/how-to-use/symbolspalette/usage/edit-mode.md).
If you want to delete a **Custom Class** you use **Delete** from the context menu of the class.
Now the deleted class was deleted.
If you delete a **Custom Class** with sub classes...
...the **Custom Class** and its sub classes will be deleted.
If there are **Custom Objects** or **Hyperlinks** added for a **Custom Class**, then a dialog will appear.
In this example the **Engineering** class is empty.
But there is a **Hyperlink** for the **PlantTools Help** class.
Now we delete the **Documents** class.
Since at least one **Custom Class** has a **Custom Object** or **Hyperlink** the following dialog asks you, if you want to **Delete Custom Class** which will delete the class and all its sub classes no matter if there are customer objects or hyperlinks. With **Delete only empty Custom Classes** will only delete a custom class if there are no custom objects or hyperlinks for the class. **Cancel Deletion of Custom Class** will just do nothing.
We use **Delete only empty Custom Classes**.
The result is, that only the **Engineering** class was deleted, but the **Documents** and **PlantTools Help** class is still there.
Now we delete again.
But this time we use **Delete Custom Class**.
Now the **Documents** class is gone as well.
At the end of the process disable the **Edit Mode** again (see [Edit Mode)](/plant-tools/plantexpresstools/how-to-use/symbolspalette/usage/edit-mode.md).