In the main menu of the Open Single Management Platform Console, go to the Application & Services → NGFW section.
Delete a subinterface in one of the following ways:
If you want to delete a subinterface in a network template, in the menu, select the Network templates tab, click the network template, and select the Interfaces section.
If you want to delete a subinterface on a device, select the Devices tab in the menu, click a device, and select the Interfaces section.
The table of network interfaces is displayed.
Expand the list of subinterfaces of the parent interface by clicking the arrow next to the name of the parent interface.
Select the check box next to one or more subaddresses that you want to delete.
In the upper part of the workspace, click the Delete button.
Confirm the deletion.
The selected subinterfaces are deleted.
Apply the OSMP policy changes by clicking the Commit and push button.