Thank you so much every one for the help. It would have been so cool to see a intercom to flush the toilet.........

Few quick questions. ...

To my understanding the Altronix RB1224 relay will act like a momentary switch.
In my application it could be a way to open or close a garage door.

The Altronix RBR1224 relay is a latching relay and stays latched when power is removed. For my application I would like to do the following things.
1. Be able to turn off/on background music in any particular room.
2. Be able to turn off/on a loud bell in the garage and so on.
3. Be able to turn off/on a light.

My power supply is a WECO SD-81824-01 so it looks like the grounds are not commoned (tied together) unless it’s internal, each gourd has its own terminal. I am thinking that I would take the power ether from a extra lug from the block if one is available or just take a extra jumper cable and tie it to the 24vdc from the power supply terminals.

One last question......
Since I will be using few relays, what do you guys recommend for a neat cable management for the 24VDC power.

Here is what I am thinking…..
Make a jumper cable from the power supply and connect it to a 66 block. And on the 66 block ether wire the positive and negative like you would tip and ring or do top half of the block positive and bottom half negative.

Please share your ideas.