If the reimbursement is taxable income (ie. as designated in box #1 on your W-2) you can deduct your continuing education expenses in full.
Otherwise, one can only deduct unreimbursed expenses.
To deduct your continuing education expenses:
Type in 2106 in the search
box, top right of your screen, then click the magnifying glass
Click the jump to 2106 link
in the search results.
Follow the prompts and onscreen
instructions
See Any Other Expenses? Page
Education Expenses
, 6th category down