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Several times, recently (in a sandbox game where I'm building up the knowledge and skill to consider taking on a career game, as well as putting together a library of my own rocket designs), I've wished I could take a stack of parts off an existing vessel and either convert them into a vessel in their own right, or mount them (or multiple copies of them) onto another vessel. I know I can stash removed subassemblies aside in the VAB, but they vanish when I load another vessel. Say I've got a booster design I really want to add to another, better core -- how can I do that without having to build the thing up from scratch again? Or I finally got my lander figured out -- but because I built the vessel down from the command pod, I can't take off parts to leave just the lander; rather, I'm stuck with the "lander and everything above it" or, if I built up from a booster engine, "lander and everything below it." i suspect, as is usually the case when I think there's something I'm not allowed to do in KSP, that there's a reasonably simple, reasonably efficient way to do this, else why would assemblies like landers appear in the premade vessels library in a freshly installed game? That said, I haven't seen any reference anywhere to the ability to do this. What am I missing?