Hi virgo731
Persistent disks must always be reconnected to the OS that was used when they were created.You cannot detach a persistent disk from a Windows 7 linked clone and recreate or attach the persistent disk to a Windows 10 linked clone. But you can migrate your users profile from Windows 7 desktops to Windows 10. You can also use 'Robocopy' to copy the user data.
Migrating User Profiles with Horizon Persona Management
User Profile Migration Overview
