If you select the Item menu from the menu bar, submenu will come up like <Figure 1>.
<Figure 1> Item menu from the menu bar at OPC Client Main
Item menu bar consists of Add Item, Insert Item, Delete Item and Modify Item Properties.
Add Item : Add a new OPC item at selected group. (Bottom of the list)
Insert Item : Insert a new item at upper what you select.
Delete Item : Delete an item which you select.
Modify Item Properties : It is menu to modify an item properties which you select.
Reference) If you don't select the items at Server/Group/Item display area(In case of selecting the server or group), Item menu bar doesn't be activated.
Relate items)