The ornamental design for a multi-functional work surface for a seatingunit, as shown.
The FIGURE is a perspective view of the top, front, and one side of a
multifunctional work surface for a seating unit showing my new design it
being understood that the broken lines are for illustrative purposes only
and form no part of the claimed design.
The surface(s) or portion(s) of the article not shown in the drawing or
described in the specification form(s) no part of the claimed design.