Steps To Create New Movement Types in SAP MM

Assuming you  want to create another movement type 901.
Transaction OMJJ

• Select any  standard movement type such as  201
• Click copy, then overwrite the 201 with 901
• Click the Enter button, then click Copy all
• Select the new movement type 901
• On the left hand column screen, click Reversal/follow-on movement
• Fill in the reversal movement type

For the rest of the options, you can leave it alone or change it depending on your requirement