Dean Witter, a unit of Dean Witter, Discover & Company, has 8,100 brokers.

Allstate, a unit of Sears, Roebuck & Company, is the second- largest property insurer in Florida after State Farm.

PCS Health Systems, a unit of Eli Lilly & Company, for example, maintains an electronic data base.

Marion is a 44-year-old saleswoman who was treated for depression under coverage provided by a unit of Merck & Company.

The firm, a unit of Morgan Stanley Dean Witter & Company, has eliminated all margin lending on 16 stocks, up from just two issues six weeks ago.

When the deal was first announced last September, Philips was to be acquired by a unit of Merrill Lynch & Company at $25.50 a share.

Allstate, a unit of Sears, Roebuck & Company, would sell its corporate accounts and group brokerage operations.

Merck-Medco, a unit of Merck & Company, which sells drugs and manages drug benefits for health plans, advised 1,100 customers to limit coverage to 12 pills a month.

If its proposal is successful, Bain Capital, a unit of the Boston-based Bain & Company, would have a majority of the equity.

The reports said that Dean Witter, a unit of Sears, Roebuck & Company, would route its institutional orders through its consumer markets business.