Hi Dale,
Thanks for your interest in Syncfusion products.
We have created a sample on your requirement, in which we have used six series, out of which 3 will be sharing the primary Y-Axis and the other three will be sharing the secondary Y-Axis.
You can download the sample from the below given link,
Sample with sharing Multiple AxesIn this, the top chart shows the default behavior whereas the bottom shows the behavior as you required.
If this doesn't meet your needs, please let us know.
Regards,
Pavithra.J