Use this dialog box to recalculate period details for a specific template at a particular site. You display this dialog box by right-clicking in the header of the Gross Requirements by Template tab in the MRP Part Information window and then clicking Recalculate Period Template.
Perform MS level 
0
Perform MS level 1
Perform MRP 
Recalculate period 
template for material plan graph
Recalculate 
period template for ms graph