Update capacity-reservation-create.md

Author: tferdou1

articles/virtual-machines/capacity-reservation-create.md

@@ -33,6 +33,51 @@ The Capacity Reservation must meet the following rules:
 - For a Capacity Reservation group that supports zones, each reservation type is defined by the combination of **VM size** and **zone**. For example, one Capacity Reservation for `Standard_D2s_v3` in `Zone 1`, another Capacity Reservation for `Standard_D2s_v3` in `Zone 2`, and a third Capacity Reservation for `Standard_D2s_v3` in `Zone 3` is supported.
 
 
+## Checking VM sizes available for Capacity Reservation in a region
+
+Before creating capacity reservation, VM sizes available for reservation can be checked for a particular region.
+
+ 
+### [Portal](#tab/portal1)
+
+<!-- no images necessary if steps are straightforward --> 
+
+1. Open [Azure portal](https://portal.azure.com)
+1. In the search bar, type **Capacity Reservation groups**
+1. Select **Capacity Reservation groups** from the options
+1. Select **Create**
+1. Under the *Basics* tab, create a Capacity Reservation group:
+    1. Select a **Subscription**
+    1. Select or create a **Resource group**
+    1. **Name** your group 
+    1. Select a **Region** 
+    1. Optionally select **Availability zones** or opt not to specify any zones and allow Azure to choose for you
+1. Select **Next**
+1. On VM size, click on **See all sizes** to check what VM sizes are available for Capacity Reservation
+
+
+ ### [PowerShell](#tab/powershell1)
+
+1. Before you create a capacity reservation, you can check the reservation available VM sizes for the region selected using Get-AzComputeResourceSku for Capability property for Resource type Virtual Machines. The following example lists the capacity reservation available VM sizes in East US location:
+
+
+
+    ```powershell-interactive
+    $vmsizes = Get-AzComputeResourceSku -Location eastus | where {$_.ResourceType -eq "virtualMachines"}
+    foreach($vmsize in $vmsizes) { foreach($capability in $vmsize.capabilities) {  if($capability.Name -eq 'CapacityReservationSupported' -and $capability.Value -eq 'true'){ $vmsize.name  } } }
+    ```
+    
+    
+    ### [CLI](#tab/cli1)
+
+1. The following example lists the capacity reservation available VM sizes in East US location using Azure CLI:
+
+    ```azurecli-interactive
+    az vm list-skus -l eastus --resource-type virtualMachines --query "[?contains(capabilities[?name == 'CapacityReservationSupported' && value == 'True'].name,'CapacityReservationSupported')].name"
+    ```
+--- 
+<!-- The three dashes above show that your section of tabbed content is complete. Do not remove them :) -->
+
 ## Create a Capacity Reservation 
 
 ### [API](#tab/api1)