Patent Publication Number: US-D958831-S

Title: Display screen or portion thereof with transitional graphical user interface

Description:
FIG. 1  is a front view of the first image in a sequence for a display screen or portion thereof with transitional graphical user interface showing my new design; 
         FIG. 2  is the second image thereof; 
         FIG. 3  is the third image thereof; 
         FIG. 4  is the fourth image thereof; and, 
         FIG. 5  is the fifth image thereof. 
       The outer perimeter illustrated by a pair of dashed broken lines in the drawings illustrates a display screen or portion thereof and forms no part of the claimed design. The remaining broken lines in the drawings illustrate portions of the graphical user interface that form no part of the claimed design. 
       The appearance of the transitional image sequentially transitions between the images shown in  FIGS. 1-5 . The process or period in which one image transitions to another images forms no part of the claimed design.