The ornamental design for a sectionaloverheaddoor, as shown and described.
FIG. 1 is a front elevation view of a sectional overhead door according to my new design; and,
FIG. 2 is a front elevation view of a sectional overhead door comprising the design of FIG. 1 and showing an additional door portion in broken lines.
The views of the sectional overhead door not shown form no part of the claimed design.
The broken lines depicting various ornamental and functional elements of the doors and door sections represent environmental elements only and form no part of the claimed design.