Maybe.
If you have an M1 (ARM) mac, then no, you can't. If you're on an intel machine, read on:
You can virtualize 10.6.8 (not 10.6.3) Server (not client) edition, but there may be issues getting the tools to install (the workaround seems to be to set the computer clock back to a date prior to 2018).
The hardest thing is getting a hold of 10.6.8 Server install media - it's no longer available from Apple, and most internet sites are sketchy.
Honestly, its vastly past time to move on from any solution that requires 10.6.8. If you have the option to upgrade the other software, that's the better option.
