You can move a VM and its associated resources to a different subscription by using the Azure portal.
Moving between subscriptions can be handy if you originally created a VM in a personal subscription and now want to move it to your company's subscription to continue your work. You do not need to start the VM in order to move it and it should continue to run during the move.
References:
https://docs.microsoft.com/en-us/azure/virtual-machines/windows/move-vm

Explanation:

Azure AD join only applies to Windows 10 devices.
References:
https://docs.microsoft.com/en-us/azure/active-directory-dom ain-servic es /manage-group-policy
https://docs.mic rosof t.com/en-us/azure/active-directory/ device s/a zureadjoin- plan

There are different payment options in Azure including pay-as-you-go (PAYG), Enterprise Agreement (EA), and Microsoft Customer Agreement (MCA) accounts.
Your Azure costs are 'per subscription'. You are charged monthly for all resources in a subscription.
Therefore, to use different payment options per department, you will need to create a separate subscription per department. You can create multiple subscriptions in a single Azure Active Directory tenant.
References:
https://docs.microsoft.com/en-us/azure/cost-management-billing/manage/create-subscription

Explanation:

Reference:
https://docs.microsoft.com/en-us/azure/billing/billing-add-change-azure-subscription-administrator
https://docs.microsoft.com/en-us/azure/billing/billing-upgrade-azure-subscription
https://docs.microsoft.com/en-us/azure/billing/billing-spending-limit