The ornamental design for a combinedfoldablelegsupport and support board for grill, as shown and described.
FIG. 1 is a perspective view of a combined foldable leg support and support board for grill of my new ornamental design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a left side view o thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof; and,
FIG. 8 is a perspective view thereof in a sample environmental setting.
The broken line elements in FIG. 7 form no part of the claimed design and act as a boundaries of the claimed design. All other broken lines depict environment and form no part of the claimed design.