You will find an example on these pages. Preview Editor
I set the datatype of the top group to Project. Please don’t forget to check.
I placed a dropdown inside this group. I edited it to “option set” to be similar to your example. Please also review the property editor of the dropdown.
There is also a button, you can make changes by pressing that button. Please don’t forget to review the workflows.
If there is something you do not understand, please do not hesitate to ask.