I've been having problems with my Windows software synching between my iMac and MacBook. I just had this thought today; would it be possible to copy a configured VM on Microsoft OneDrive and access it from either device? I would make sure Parallels is quit on the iMac before opening the VM up on the MacBook, so there wouldn't be any issues with two devices trying to make changes to the VM at the same time. It seems this would work, assuming bandwidth and storage space were sufficient.