The ornamental design for a partitionpanelportion, as shown and described.
FIG. 1 is a perspective view of a partition panel portion showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a partial enlarged view thereof, taken along line 4 of FIG. 1;
FIG. 5 is a partial enlarged view thereof, taken along line 5 of FIG. 2; and,
FIG. 6 is a cross-sectional view thereof, taken along the line 6-6 in FIG. 5.
The broken lines shown in the drawings illustrate portions of the partition panel portion that form no part of the claimed design. The dash-dot lines shown in the drawings define the bounds of the claimed design that form no part of the claimed design.