Adding "Select Parent" command to Cinema 4D

1. Run the script manager, menu Script ➩ Script Manager (Extensions ➩ Script manager in R21)
2. Choose Python (for C4D below R20)
3. Start new script, menu File ➩ New File
4. Paste the code into the code field
as shown on the picture

5. You can render (current viewport) or load the icon for your script using File ➩ Render or File ➩ Load Icon
6. Save your new script File ➩ Save the script
7. Push the Shortcut button on the bottom right, assign your own key
8. Save your C4D config

You're done