Hi,
and welcome to the forums!
If you want to print with PVA and a BB core, you need to tell Cura which extruder to use for support material.
If by contrast you want to print with two AA cores, then check out the manual section about merging models.
https://ultimaker.com/en/resources/35686-merging-and-grouping-models
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Strick9 0
So you are wanting to print something that is only PVA?
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