The ornamental design for a golf ball stacking tray portion, as shown and described.
FIG. 1 is a cutaway top, front and left side perspective view of a golf ball stacking tray portion in accordance with my invention, with a portion shown in dashed, phantom lines for environmental purposes only that forms no part of my design; and,
FIG. 2 is a cutaway bottom, front and left side perspective view thereof, with a portion shown in dashed, phantom lines for environmental purposes only that forms no part of my design.
That which is depicted in solid lines in the drawing represents the claimed invention and that which is depicted in broken lines forms no part of the claimed invention.