The ornamental design for a portion of a footwear upper, as shown and described.
FIG. 1 is a lateral perspective view of a portion of a footwear upper showing my new design;
FIG. 2 is a lateral side elevational view thereof;
FIG. 3 is a medial side elevational view thereof;
FIG. 4 is a front elevational view thereof;
FIG. 5 is a rear elevational view thereof.
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken lines in FIGS. 1–7 represent portions of the footwear that form no part of the claimed design. The broken lines which define the bounds of the claimed design form no part thereof.