Transitional image for a portion of a display screen

FIG. 1 is a front view of a the first image of a transitional image for a portion of a display screen showing our new design;

FIG. 2 is a front view of the second image thereof;

FIG. 3 is a front view of the third image thereof;

FIG. 4 is a front view of the fourth image thereof;

FIG. 5 is a front view of the fifth image thereof; and,

FIG. 6 is a front view of the sixth image thereof.

The appearance of the image transitions sequentially between the images shown in FIGS. 1-6. The process or period in which one image transitions to another forms no part of the claimed design. The broken line showing of various regions and the unshaded areas there within form no part of the claimed design. The broken line showing of the display screen is for illustrative purposes only and forms no part of the claimed design.