I want to be abe to choose from only 6 time entry categories / descriptions

How can I restrict the description that my employees can enter?

I get unlimited variations on what they enter which means its impossible to organize the time later for job costing.

For example, on a project, I want only these 6 choices for their time: A/V, Lighting, Shades, Climate, Cameras, Other.

Any way to restrict them from writing whatever they want? I get time entries like “onsite”, or “programming”.

Thanks!