The ornamental design for a sectionalsofaendsection, as shown and described.
FIG. 1 is a front view of a sectional sofa end section.
FIG. 2 is a rear view of the sectional sofa end section.
FIG. 3 is a left side view of the sectional sofa end section.
FIG. 4 is a right side view of the sectional sofa end section.
FIG. 5 is a top view of the sectional sofa end section.
FIG. 6 is a bottom view of the sectional sofa end section.
FIG. 7 is a top view of the sectional sofa end section with phantom lines indicating the environment within which the end section is positioned within the sectional sofa; and,
FIG. 8 is a front left perspective view of the sectional sofa end section with phantom lines indicating the environment within which the end section is positioned within the sectional sofa.