How to remove assets on reimport automatically?

So i have some object in my Blender project. I export them into fbx. Then i place file into Unreal Project directory and it automatically asks me if i wont that file to be imported. Then i import it as separate object and place in scene.

Now i delete/merge some objects in Blender, and import everything again rewriting the file.

What i want is messing object to be deleted from assets and scene.
What i get now: Unreal goes crazy and make every object a copy of merged of all objects in fbx file.

So what am i doing wrong, or i ask too much?

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