how to access apps that use 32-bit

I recently upgraded to Big Sur but I have a small Mojave APFS volume that I can boot to occasionally use 32-bit apps (Mac mini 2018). In Big Sur I have a VMware virtual machine that I use for some Windows 10 apps and also for older macOS like Mojave.

You can't. Upgrade or replace them, or if your computer shipped with Mojave or earlier, reinstall the older OS.

(201550)