You can choose to ignore units so they don't appear in the list of discovered units of the Unit enrollment tool.
From the home page, click
.The Unit enrollment tool opens with the list of units that have been discovered on the system.
Right-click the unit you want to ignore, and select
The unit is removed from the list and will be ignored when the Unit enrollment tool discovers new units. For information about removing a unit from the list of ignored units, see Removing units from list of ignored units.