There is a command group 'az_network_vnet_subnet'. This group of commands could 'manage subnets in an azure virtual network'. The group of commands has global parameter '--debug' which means 'Increase logging verbosity to show all debug logs.'. The group of commands has global parameter '--help -h' which means 'Show this help message and exit.'. The group of commands has global parameter '--only-show-errors' which means 'Only show errors, suppressing warnings.'. The group of commands has global parameter '--output -o' which means 'Output format.'. The group of commands has global parameter '--query' which means 'JMESPath query string. See <a href="http://jmespath.org/">http://jmespath.org/</a> for more information and examples.'. The group of commands has global parameter '--subscription' which means 'Name or ID of subscription. You can configure the default subscription using `az account set -s NAME_OR_ID`.'. The group of commands has global parameter '--verbose' which means 'Increase logging verbosity. Use --debug for full debug logs.'. This group contains a child command 'az_network_vnet_subnet_create'.The syntax is: az network vnet subnet create --name
                              --resource-group
                              --vnet-name
                              [--address-prefixes]
                              [--delegations]
                              [--network-security-group]
                              [--no-wait {0, 1, f, false, n, no, t, true, y, yes}]
                              [--route-table]
                              [--service-endpoint-policy]
                              [--service-endpoints]. The 1th example of the child command would be to use it to 'create new subnet attached to an nsg with a custom route table', the syntax is: az network vnet subnet create -g MyResourceGroup --vnet-name MyVnet -n MySubnet --address-prefixes 10.0.0.0/24 --network-security-group MyNsg --route-table MyRouteTable. The 2th example of the child command would be to use it to 'create new subnet attached to a nat gateway', the syntax is: az network vnet subnet create -n MySubnet --vnet-name MyVnet -g MyResourceGroup --nat-gateway MyNatGateway --address-prefixes "10.0.0.0/21". The parameter '--name -n' is required. It is used to the subnet name.. The parameter '--resource-group -g' is required. It is used to name of resource group. you can configure the default group using `az configure --defaults group=<name>`.. The parameter '--vnet-name' is required. It is used to the virtual network (vnet) name.. The parameter '--address-prefixes' is optional. space-separated list of address prefixes in cidr format.  support shorthand-syntax, json-file and yaml-file. try "??" to show more.. The parameter '--delegations' is optional. space-separated list of services to whom the subnet should be delegated, e.g., microsoft.sql/servers.  support shorthand-syntax, json-file and yaml-file. try "??" to show more.. The parameter '--network-security-group --nsg' is optional. name or id of a network security group (nsg).. The parameter '--no-wait' is optional. do not wait for the long-running operation to finish.. The parameter '--route-table' is optional. name or id of a route table to associate with the subnet.. The parameter '--service-endpoint-policy' is optional. space-separated list of names or ids of service endpoint policies to apply.  support shorthand-syntax, json-file and yaml-file. try "??" to show more.. The parameter '--service-endpoints' is optional. space-separated list of services allowed private access to this subnet. values from: az network vnet list-endpoint-services.  support shorthand-syntax, json-file and yaml-file. try "??" to show more.. 