I'm unable to add employee expenses in Turbotax Self-Employed. After I used start-over under Tax Tools I lost the option to enter employee wages. I've cleared cache/cooki

Employee business expenses are no longer deductible, except for certain employment categories.  See this IRS reference for details:

https://www.irs.gov/newsroom/heres-who-qualifies-for-the-employee-business-expense-deduction

Expenses related to self-employment are deducted as business expenses on Schedule C.

W-2 employee wages are entered in the Wages and Salaries section of Personal Income.

When you say employee expenses, are you referring to W-2 employee? There is no longer employee expenses with TCJA as of 2018.

If you are referring to expenses as a self-employed person, delete your Schedule C and start over from scratch.

Here's the general procedure for viewing the forms list and deleting unwanted forms, schedules, and worksheets in TurboTax Online:

1. Open or continue your return in TurboTax.
2. In the left menu, select Tax Tools and then Tools.
3. In the pop-up window Tool Center, choose Delete a form.
4. Select Delete next to the form/schedule/worksheet in the list and follow the instructions.

To go to Schedule C:

1. After signing into TurboTax, select "Take Me to My Return"
2. Type "Schedule C" in the search field at the top right hand of the screen.
3. Select "Jump To Schedule C" and you will be brought to the section of TurboTax where you can enter or have entered your business income and expense information.