General Motors of Canada Co. is working to set up jobs and training programs for employees who will be put out of work when it closes the Oshawa Assembly plant next year, even as Unifor promises an extended fight to keep the operation open. In addition, GM estimates about half of the 3,000 unionized and salaried employees are eligible to retire under the company's defined benefit pension plan — leaving about 1,500 who will want to transition to new occupations.