Is there any possibility?...
I've been searching alot this thing and didn't found anything at all.
EDIT: Actually, someone please delete this. I am stupid.
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Deformat, the thing you are(or were) searching for is call "In Context". These are parts that are created inside(and saved inside) an assembly with no external links. I typically follow the master-model style of modeling where you have a multibody part. It seems more stable to me.