You’ll need to have the mesh precut before importing it, then you can choose, sequence, matinee or even just gravity, and probably more choices I just don’t know the engine enough to tell you more, but the sure thing is you’ll need two meshes. You can have a look to destructible meshes too but I’m not sure of the result.
And yes you can use the sequencer with a trigger event or a box trigger playing the sequence. If you want the detached mesh to go in a certain direction depending of the player rotation, then it’s more a projectile movement you need