# Adding a POU from the file system

1. This function allows you to add a Program Organisation Unit from your file system.

1. Start editing the real-time application.
2. In the menu bar, click Program.
3. In the POU tree, click ⋮.
4. In the menu, click Add from file.
5. Select a Program Organisation Unit file from your file system (filename extension: .ucpou) and open it.

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