As a W-2 employee, you can't deduct expenses related to your employment.
What expenses do you have specifically as a shareholder that are different from your employee expenses? What kind of company? What kind of partnership?
Any business can always reimburse partners or employees for work-related expenses on a tax-free basis if the business follows an accountable plan. That makes the expense a deductible business expense for the firm and non-taxable reimbursement for the worker. See publication 463 and 535.
https://www.irs.gov/forms-pubs/about-publication-463
https://www.irs.gov/publications/p535
