Hi @Sanjay_paul,
This option allows you to choose the injection control method that best matches your press. I would suggest reviewing your molding machine's information to determine the best way to create the Injection Molding Machine within Moldflow. Reviewing the units can help key in to how the press is set up also if not familiar with it. Setting the press Filling control can enable easier correlation when entering Process Settings in your studies and then into your press.
Check out the following help document on this:
Regards,

Kristen Kilroy
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