@MrAeon1111 There are two ways.
Behaviors that don't have anything attached to the top are triggered when the scene starts. We call these root behaviors. You can have your Set Attribute behaviors be root behaviors.
In the editor, you can define object attributes from the selected objects like shown in the screenshot below.
[image: 93b50169-ebd7-4d97-8a7c-4760438b5f9b.jpeg]