Managing permissions for Azure Reserved VM Instances using Powershell needs to be developed
Currently in order to grant permissions(ex : Reader Role) on existing Azure Reserved VM Instances, one has to navigate to the IAM manually and select each Reservation(id) and grant the required permissions as stated in the link(https://docs.microsoft.com/en-us/azure/billing/billing-manage-reserved-vm-instance)
This process will be hectic when tenant has Reservation Id's in 100's or even below 100. This needs to be managed more easily via powershell.
Double that when you have to grant permission in the Reservation and the Reservation Order