How do I backweld?

I've been trying to make a welding scipt for a melee weapon I made.I want it to display the weapon onto my character's back while I have it unequipped.The problem is that all i find are backwelding scripts for melee weapons that only use the handle and a mesh over it,so I don't know how to specify where the other parts of the weapon go.(My weapon is a model,not a single part).I have a normal welding script on the weapon,I can hold it in my hand while it's equipped,but I just can't figure out how to specify the script that there are also other parts.I'd really like if someone could help me.Thanks for the time.