Different Objects won't move

I have designed a submarine with several parts. Each one was started in " Objects ". In game logic only the single object moves, but the ones that were also added in as objects parts don’t. How can I change the objects that don’t move, to move as one other than adding a LOT of logic bricks. IYSWIM. I tried grouping them and other ways, but nope. I can always restart again, but if there is a method to do this it would save a lot of work.
Dicon

AS you can see there are a lot of parts that were added in Object.


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Parent them. Make a box for the body and parent the parts to it. So the logic will be in the body box.

Thanks Akira San, leaning something new everyday.
I hope I can remember ALL of it.
Thanks again.
Dicon

Can’t you just join them all together?
ctrl+j to make different meshes join.