Display screen or portions thereof with transitional graphical user interface

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

FIG. 2 is a second image in a sequence thereof;

FIG. 3 is a third image in a sequence thereof;

FIG. 4 is a fourth image in a sequence thereof;

FIG. 5 is a fifth image in a sequence thereof;

FIG. 6 is a first image in a sequence for a display screen or portions thereof with transitional graphical user interface, showing our new design in a second embodiment;

FIG. 7 is a second image in a sequence thereof;

FIG. 8 a third image in a sequence thereof;

FIG. 9 is a third image in a sequence thereof; and,

FIG. 10 is a fifth image in a sequence thereof.

The broken lines illustrating portions of the transitional graphical user interface form no part of the claimed design.

The outermost broken lines illustrating the display screen or portion thereof form no part of the claimed design.

The appearance of the image transitions sequentially between images shown in FIGS. 1 through 5 and FIGS. 6 through 10 . The process or period in which one image transitions to another forms no part of the claimed design.

The solid black shading in FIGS. 6 through 10 illustrates a contrast in appearance.