The ornamental design for a cart apparatus with a top support having a plurality of openings, as shown and described.
FIG. 1 is a front perspective view of a cart apparatus with a top support having a plurality of openings showing my new design, shown with the door closed;
FIG. 2 is another front perspective view thereof;
FIG. 3 is a front perspective view thereof, shown with the door and side panel removed;
FIG. 4 is a front view thereof;
FIG. 5 is a rear view thereof;
FIG. 6. is a right side view thereof;
FIG. 7 is a left side view thereof;
FIG. 8 is a top view thereof; and,
FIG. 9 is a bottom view thereof.
The broken lines shown in the figures show portions of the cart apparatus with a top support having a plurality of openings which are not part of the claimed design.