yes you can choose to do that. however if your employer's plan is considered affordable under the law (meaning your individual premium costs no more than 9. 5% of your income) you won't qualify for subsidized insurance through your state's marketplace. however you may find that even without a tax credit buying a health plan for your daughter outside of work is less expensive. if so there's nothing stopping you from going that route.
i have insurance through my work. but if it's cheaper would i be able to cover my daughter with insurance through the marketplace instead of putting her on my insurance at work?