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Have arc,sub and two one SLs in the same room. ARC is registered to another room. Need to change so that all the components registered to the same room

So you want to use the speakers that are in the same physical room to act as a surround system?

Take these steps unpair the the One SL’s (that now for a stereo set up, having their own “room” in the Sonos app): https://support.sonos.com/en/article/separate-a-stereo-pair

When you’ve done that ad them to the Arc “room” as surrrounds: https://support.sonos.com/en/article/add-surround-speakers-to-a-sonos-home-theater