Is there a way to clone a group of parts?

I have a rocket launcher weapon, but the rocket itself, which I modeled, is composed 3 parts (in a group). I would union the parts, but I get an error that the triangle count is too high. My rocket launcher script, the standard Roblox rocket launcher script, works by cloning the rocket then firing the clone, however, it doesn't work with my rocket group and I can't find a way around it. Any ideas?

if you are cloning from any sort of storage service to the wrokspace, do mind that surface joints are not saved because they are controlled by the workspace. either put a sort of autoweld script in the tool, or use MakeJoints:

local a = something:Clone()
a.Parent = workspace
a:MakeJoints()