You can use System Manager to create and manage FC/FCoE adapters.
More information
Editing the FC/FCoE adapter speed
You can modify the FC/FCoE adapter speed setting by using the Edit FC/FCoE Adapter Settings dialog box in System Manager.
Configuring subnets (cluster administrators only)
Subnets enable you to allocate specific blocks, or pools, of IP addresses for your Data ONTAP network configuration. This enables you to create LIFs more easily when using the network interface create command, by specifying a subnet name instead of having to specify IP address and network mask values.