The ornamental design for a portion of an overhead garage door façade, as shown and described.
FIG. 1 is an elevational view of a portion of an overhead garage door façade showing my new design in a closed configuration; and,
FIG. 2 is an elevational view of a portion of an overhead garage door façade showing a portion of my design in a partially open configuration.
The broken line showing of the handles in FIG. 1 and the remainder of the garage door in FIGS. 1-2 are for illustrative purposes only and form no part of the claimed design. The broken line showing of the garage building structure in FIGS. 1-2 and garage contents in FIG. 2 are for illustrating an environment of the design and form no part of the claimed design.