In hierarchy maintenance choose  Goto Work cntr. assignment.

If no work centers have yet been assigned to the hierarchy, the dialog box Choose work centers appears.

If work centers have already been assigned, they are listed. Choose  Edit New assignments

Enter the plant where the work centers are, that you want to assign to the hierarchy.

You can restrict the selection of the work centers further by entering the relevant details.

Choose Enter .

You return to the Create Hierarchy: Work center assignment screen :

In the screen section Assignments, select the work centers that you want to assign.

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If you do not select work centers, they will not be assigned.

If you want to assign more work centers, choose  Edit New assignments.

To position the work centers correctly in the hierarchy, choose  Goto Graphic.