+1 but you can actually do this via workaround if you simply create a copy of the BIAB app in the same folder.

then you can launch two instances of the same app and ( i think... ) cut and paste between them.

Big Sur, Mac Mini i7 2018, 64GB RAM 2TB SSD
Yamaha PSR SX 900, Cubase, Ableton, UNIFY, OPUS ORCHESTRATOR, MASCHINE, Vienna Ensemble Pro ,Audiofuse, L6 HELI, KOMPLETE, Komplete Kontrol 88
Lockdown beard, podgy face, beer belly, bald patch ... yadda yadda