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; 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 simulated door jambs and the remainder of the garage door 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 and 2 and the vehicles shown in FIG. 2 are for illustrating an environment of the design and form no part of the claimed design.