You can perform replanning under the Lead time chart tab. The lead time chart shows, in a "Gantt chart", the interrelation between M-parts and operations in an order. You will also find this tab in the Loading Selection and Order List - Manufacturing procedures. Read more about the Lead time chart in the Help function for the Order List procedure.
The Lead time chart tab is activated by using the Replan alternative in the Info menu (when right-clicking) in the List tab.