@Simarpreet Singh You can assign Azure Reserved VM Instances benefits at the enrollment or subscription levels, and easily change assignments post purchase, as necessary. Assignment allows you to decide whether the reserved instance is applied at the Azure account/enrollment or subscription level. This gives you flexibility for savings. For example, if you want to buy reserved instances to save money for your organization, you can assign all Azure Reserved VM Instances at the account level. Conversely, if a business unit, such as finance, wants to buy an Azure Reserved VM Instance for its own use only, it can be assigned to a subscription where only that group can take advantage of the savings.
Hope this helps!
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