Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
In order to advise you specifically and particularly, I would need to know what App you are using with your SoundBar ( - I at least can guess it is a Bose SoundBar, but of that I am not quite certain.) Also it might help if I knew whether you have an Android handheld device that you are running the App for the SoundBar on.
But there is certainly a wide variety of choices for SoundBar apps. The answer to your question, might ultimately be to use a different app than the one I might guess you are using, the SoundTouch app. It might be that the capability you are looking for just isn't there.
I think the way the SoundTouch app is supposed to be used is, for the preset to be pointed to a playlist, rather than to be a playlist itself. If you point it to an album, that constitutes the whole of the preset, in the SoundTouch app anyway. So if you point it to another album, then it becomes nothing but that other album. In other words, the presets in SoundTouch app are unitary... unless you point a preset to a playlist, e.g. in iTunes.