The ornamental design for a portion of a vehicle interior, as shown and described.
FIG. 1 is a partial left perspective view of a portion of a vehicle interior showing our new design;
FIG. 2 is a partial right perspective view thereof; and,
FIG. 3 is an elevational view thereof.
The broken line showings of the instrument panel and steering wheel mount are for illustrative purposes only and form no part of the claimed invention.