Display screen or portion thereof with transitional graphical user interface

Description

FIG. 1 is the first image in a sequence for a display screen or portion thereof with transitional graphical user interface showing our new design;

FIG. 2 is the second image thereof;

FIG. 3 is the third image thereof; and,

FIG. 4 is the fourth image thereof.

The outermost broken lines in the drawings depict a display screen or portion thereof and form no part of the claimed design.

The appearance of the transitional graphical user interface sequentially transitions between the images shown in FIGS. 1-4. The process or period in which one image transitions to another image forms no part of the claimed design.

The grayscale tones in the drawings represent a contrast in appearance.

Claims

The ornamental design for a display screen or portion thereof with transitional graphical user interface, as shown and described.