# Creating a custom POU

1. You can create a custom Program Organisation Unit in the POU tree.

1. Start editing the real-time application.
2. In the menu bar, click Program.
3. Click the plus icon behind the entry field Filter.
4. Identifiers are case insensitive and must begin with a letter or underscore character. Multiple consecutive underscores or trailing underscores are not allowed.Name the Program Organisation Unit uniquely.
5. In the listbox Type, select the type of the Program Organisation Unit.
6. In the listbox Language, select the programming language you want to use.
7. Enter a description.
8. Click Save.

1. The custom Program Organisation Unit is displayed in the POU tree and the catalogue.