Anyone? How did @ecati did it? Thanks..

@ecati said:

Do you want to do something like this?

Yes, exactly!
There will be more of that, but I'm stuck at the beginning.

Hi guys, this is frustrating me for several days.
I have one object - bed frame - with one hinge. And it's working, I can move with it as I want. But when I add another object with hinge, that should be connected to bed frame, bed frame stops move. Only that object is moving. I'm completly lost what to do.. Please see video to be more clearly for you.
Thank you for your help.