To create a custom property you need to connect to the database in Configurator, expand the database Entities option, then expand the required Entity and select the Properties option:
Right click on Properties and select Add Property option:
Enter Property Settings:
Important! If you uncheck AllowNull option, this property will be required.
Tip: There is no need to enter property’s name to each of 3 fields (Meta name, Name, Display name). You can enter the name to Meta name field only and it will appear in all 3 fields:
When your custom property is ready, you need to save and commit the changes: