Remote control of soundbar + TV?

I have a Sony TV with a Yamaha sound bar. The Roku remote paired with the TV controls all functions except on and off for the TV. The Roku remote turns only the sound bar on and off. It does control the volume of the soundbar. How can I make the remote turn off the TV as well as the sound bar? If I cannot, how can I make the remote turn on and off the TV and leave the sound bar on?

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