The ornamental design for an automobilegrilleportion, as shown and described.
FIG. 1 is a front and left side perspective view of an automobile grille portion showing my new design;
FIG. 2 is an enlarged partial front and left side perspective view thereof;
FIG. 3 is a front elevation view thereof; and,
FIG. 4 is an enlarged partial front elevation view thereof.
The broken lines in the drawings illustrate boundaries between the portions of the automobile grille that form part of the claimed design and portions to which are excluded. These broken line boundaries do not form part of the claimed design. Additionally, in FIGS. 1 and 3, the portions of the automobile grille shown ghosted or in halftone illustrate environmental structure and forms no part of the claimed design.