Hi! I'm new here and to wme, so don't blame me for asking dumb questions

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What I want to know is: How can I make an actor interact with an object, like for example picking up an object from the scene? How do I make that object ,like disappear from the scene once picked up?
Just one more question, I want to combine an object with another object, and then use it with an object from the scene, how do I do this? Should I make the object from the scene an entity or else?
I really need your help 'cause I'm new to scripting
Thanx!