As you may be aware, one way to optimize running costs on Azure is to use reservations, allowing you to get discount when you commit running specific workloads and SKUs (see https://docs.microsoft.com/en-us/azure/cost-management-billing/reservations/save-compute-costs-reservations/ to know more).
Another important part of running workloads in cloud services is ensuring you can delegate some administration tasks to workloads owners.
Well, until now you were not able to specifically delegate Azure Reservations management without explicitly assigned to individual reservations.
Good news as now you can.
To do so, logon to your Azure portal (https://portal.azure.com/) and search for Reservations
Once you have access the Reservations management blade click on Role assignment available in the toolbar and then Add role assignement
You can then define assign the Reservation Administrator, Reservation Reader or Reservation Purchaser roles to your users/groups