1. Go to HUD
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2.Put in your holders

3. Click on the thing your holder is for (or the place you want it to be, but can't put it there becasue there is already an object there)

4. Copy it's position
5. Close that and then choose your holder.

6. Paste the position

7. Click
, and lookey here! You have an object on an object!

You can also do this with Fields, and objects on a map, and even characters! Have fun.