Thanks for this Carolpa, it is actually good to know that with the app all functionality is available (over wifi), we also want to try and make control with a remote as simple and logical as possible.
I tried what you asked, but before that I set the two BLCs to 'Connect to (primary) - BeoSound Core' in the 'Configuration / Settings' page.
See screenshots of the app here:
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They can all be (un)ticked. Some even twice?
When in the Core I set the 'Link to other products' to 'none' - see below:
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I can still see all sources of both BLCs.
What I am after (for my friend) is that I can list 2 commands (under the Music button of the BR1) that can either control/play CD from a BC2 and CD from a BS9000. Probably DVD can activate the BC2 (that than realises it has a CD loaded), but I reckon that command is only to be found under TV sources of the BR1. Which is not logical :-).
I know I am picky, and hope things are simpler than I think.
Your help is appreciated! Regards, Johan