Portion of a display screen with transitional icon

FIG. 1 is a front view of a first image in the sequence for a portion of a display screen with transitional icon showing the 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; and,

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

The appearance of the transitional icon sequentially transitions between images shown in FIGS. 1-5 . The process or period in which one image transitions to another image forms no part of the claimed design. Both the broken line showing a portion of a display screen and the dotted lines showing various elements are for illustrative purposes only and form no part of the claimed design.