Use the Assign Properties dialog box to specify a description and network site ID to multiple subnets at one time. In Description, type the description you want to use for the subnets you selected. In Network site ID, select the network site ID that you want to assign to the subnets you selected. To assign these properties to the subnets you selected, click OK.
For details about the different procedures that you can perform by using the Skype for Business Server Control Panel, see Manage Skype for Business Server 2015.