If you select the command, the dialog box disappears allowing you to
select a system or operation in the System Editor. It reappears when a selection
is made.
The System list initially opens with Not
Assigned. The list of systems is filled automatically.
You can select a system for assignment/unassignment of products (or
parts). If Not
Assigned option is selected, all the products that are not assigned to any
system are listed.
The Operation list shows the operations that are
running on the system.