Hello Frank
Similar to my response concerning VSS, StackWise is another hardware-specific feature that is not supported by emulators such as GNS3 or VIRL.
However, Cisco’s newer version of StackWise, called StackWise Virtual, may be supported on some emulators. I say this with caution because I haven’t tried it myself, but because no special hardware is needed, (because the stack is created via regular Ethernet ports) it may be possible to emulate.
In any case, if you really want to play around with StackWise, you’ll need to obtain physical switches. Because you can find such used switches easily online, and they’re not that expensive, it may be worth the investment.
I hope this has been helpful!
Laz