Custom properties are essential to creating a game. At some point you are going to need to store a value in a property to keep track of it for reference later. Or to maintain some simple state. The Data Storage Component is used to store custom properties that can be accessed via a property reference or with an expression.
Data Storage Component
This component allows you to store custom properties that can be accessed using the component name that you set like this: "Data.myProperty". To reference the same property in a dynamic expression just do this: "Self.Data.myProperty".
You may need an ability to have a property that you can access globally across levels. This is coming very soon...