Display Screen or Portion Thereof with Transitional Graphical User Interface

The patent or application file contains at least one drawing executed in color. Copies of this patent or patent application publication with color drawing(s) will be provided by the Office upon request and payment of the necessary fee.

FIG. 1 is a front view of the first image in a sequence of a display screen or portion thereof with transitional graphical user interface showing the claimed design;

FIG. 2 is a second image thereof;

FIG. 3 is a third image thereof;

FIG. 4 is a front view of the first image in a sequence of another embodiment of a display screen or portion thereof with transitional graphical user interface showing the claimed design;

FIG. 5 is a second image thereof; and,

FIG. 6 is a third image thereof.

The dashed broken line perimeter in the drawings illustrates a display screen or portion thereof and forms no part of the claimed design.

The appearance of the transitional image sequentially transitions between the images shown in FIGS. 1 - 3 and 4 - 6 , respectively. The process or period in which one image transitions to another forms no part of the claimed design.

FIGS. 1 - 6 are illustrated to show contrasting appearance. Areas of the display screen or portion thereof with transitional graphical user interface that appear in different shades of gray represent areas with contrasting appearances.