Add missile stages.

[timid steppe]

Add a module like "Missile Stage Separator" with parameters for stage separation. The last part of a missile will be ejected and deleted. If the missile projectile doesn't really work like that, it can transform mid-flight into a different, smaller missile depending on missile design.

Primary use is to add boost phases for niche missiles or separating short-range/variable thrusters from torpedo segment for anti-submarine missiles that no longer have 4x drag when hitting the water, but retain it in the initial flight until segment separation.

[tepid hornet]

I think cluster missiles can be used like that, you can realease medium missile from medium missile cluster

[wary heath]

Matryoshka Missiles

[white moon]

Clusters already do this

[timid steppe]

And take up too much extra space making an entire new launcher

When I can just have an extra gantry that basically cuts the missile into two segments.