When resources were produced under the old deployment model, there was no provision for resource group management, resulting in the management of higher numbers of resources and the difficulty of executing easy resource management in a unified manner. The latest Azure Resource Manager deployment approach, on the other hand, allows you to move resources like virtual machines between resources, even VMs produced using the classic deployment style. To migrate standard VMs to resource groups, you can try using the Azure portal, Azure PowerShell, or the Azure CLI.