To display a custom field on the "Edit Schedule" screen for an Opportunity Product, this can be done by editing the "Multi-Line Layout" for the "Line Item Schedule" from the Object Manager.
Steps
Click the [Gear icon] at the top right of the screen | [Setup].
Click [Object Manager] | [Line Item Schedule].
Click [Page Layouts] | [(Page Layout Name)].
Click [Edit Multi-Line Layout] at the top right of the screen.
From "Available Fields," select the desired custom field and click [▶︎] (Add).
Click [Save].
Click [Save] at the top left of the screen.
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