I have a calculated filed that calculates percentage based on quantities on po line. However, this field displays values only after saving record and not while in edit mode. Is there a way to display the value in edit mode?

Not unless you script it. Calculated custom fields don't know what the "final" value on the transaction is going to be before you save, so they won't display until you save.

Thank you. Confirming if script was the only way to go or if wf cud do it but wf didn't help either