How to add entity property
WebSumo - Add Entity Property
To add Entity Property, we must be on Entity section. Click on any entity you would like to add the property. Make sure the entity chosen is in Structure view.
Scroll to Properties in Structure view, then click 
button to add a new property.
A popup Add field will appear. There are 3 fields required to fill.
Name : Name of the property.
Type : Type of the property.
Length : Length of the property.
After filling the fields required, click Save. The property will be listed in Properties list.