Thank you Mike and JustAnOld.

Yeah i am on audiophile version. Historically, since audiphile version came out years ago, i would just do the second install option of putting BinB app etc onto the internal macs nVme or SSD drive, and keeping drums and real tracks on the PG hard drive. But that install still puts the Artist Performance and Soloists onto internal drive too, during the install. So I wanted to get rid of those from the bloat on system drive.

(all our my externals are now either SSDs or nVMe off PCI slots of Mac Pro.)

Given what you mention about aliases not working, triggering a long ago memory of using symlinks (pre my having stroke and brain fog). So i suspect that is way i would need to go?

And the other suggestion of just backing up to a regular spinner and running it all off the PG hard drive aint a bad idea either.

thank you both