The case of New York subway gunman Bernhard H. Goetz could be resubmitted to a grand jury following revelations that he calmly plotted his line of fire and shot twice at one of four victims, officials said. "We have been considering" resubmitting the case, said Mary de Bourbon, a spokeswoman for Dist. Atty. Robert Morgenthau. Goetz was indicted only on weapons possession charges by a grand jury. The revelations about Goetz's actions during the Dec. 22 shootings included statements he gave to New Hampshire police several days after the incident.