How to create a custom property
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:

Learn how to choose custom property's data type
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:

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