Not too many years ago, women primarily were concerned with breaking into the job market. Yesterday more than 200 Washington women gathered to find out what to do now that they're in.

Some of the advice was elementary such as why a resume is important. Other information was more technical such as the advantages of financial planning.

"Theres' no Hollywood career development" in which a company president will walk into an office and "discover you," said Judi Hampton, corporate affairs director for Mobil Oil Co. "Your career development is really in your hands."

The message was to be assertive.

"How do you pull rank without looking like you're pulling rank?" asked one member of the audience who was concerned that her boss always took credit for her ideas.

"On an informal basis, identify something with your supervisor's supervisor as having been yours," Hampton advised. "That happens a great deal in organizations."

"In changing careers, should you take a cut in pay?" another woman asked. The only man on the six-member panel, William Morin, president of Drake Beam & associates, replied that if the move is done for a career advancement a cut in pay may not be harmful in the future.

Each of the panelists addressed a separate concern of working women. Hampton discussed climbing the corporate ladder. She suggested that women periodically list their goals, organize their work, learn from others on the job and develop a good working attitude. Be able to take constant pressure and determine who in the organization is in power, Hampton said. Kathi Bowers, vice president of the National Association of Women Business Owners, said that those women who want to start their own business should become acquainted with accounting before hirian an accountant have enough money to start out, develop credit and pay employes what they're worth.

Alexandria Armstrong vice president of Julia M. Walsh & Sons, Inc., explained the importance of financial planning. Jean Sisco, coordinator of Business and Community Relations at American University discussed job possibilities in Washington from the government to private-sector to non-profit organizations, research and development firms, and national and international offices.

The seminar sponsored by the Clairol Loving Care Scholarship Program and the Business and Professional Women's Foundation. CAPTION: Picture, Dr. Nancy Gordon moderates seminar for working women at the Brookings Institution yesterday. Some 250 attended. By Ken Fell-The Washington Post