The ornamental design for a portion of an overhead garage door façade, as shown and described.
The FIGURE is an elevational view of a portion of an overhead garage door façade showing my new design.
The broken line showing of the door handles and the remainder of the garage door in the FIGURE are for illustrative purposes only and form no part of the claimed design. The broken line showing of the garage building structure in the FIGURE is for illustrating an environment of the design and forms no part of the claimed design.