Display Screen or Portion Thereof with Transitional Graphical User Interface

The file of this patent contains at least one drawing executed in color. Copies of this patent 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 a display screen or portion thereof with transitional graphical user interface showing a first image in a sequence according to an embodiment of the claimed design.

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

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

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

FIG. 5 is a front view of a fifth image in the sequence;

FIG. 6 is a front view of a sixth image in the sequence;

FIG. 7 is a front view of a seventh image in the sequence; and,

FIG. 8 is a front view of an eighth image in the sequence.

The broken lines showing the display screen or portion thereof in the above described Figures are for illustrative purposes only and form no part of the claimed design.

The appearance of the transitional image sequentially transitions between the images shown in FIG. 1 to FIG. 8 in the embodiment. The process or period in which an image transitions to another image forms no part of the claimed design.