Which feature allows you to add time to a project by duplicating a previous time entry?

The feature that allows you to add time to a project by duplicating a previous time entry is referred to as "Copy time." This function is designed to streamline the process of tracking time spent on projects by enabling users to quickly replicate existing time entries. By using this feature, you can efficiently maintain accuracy in your time records, especially if the tasks or activities are repetitive.

In contrast, "Add time" typically refers to the function of creating a new time entry rather than duplicating an existing one. "Time tracking" is a broader term that encompasses the overall process of recording hours worked, but does not specifically pertain to the duplication of entries. "Task completion" relates to marking tasks as done rather than managing the intricacies of tracking time for those tasks. Therefore, "Copy time" is the most precise answer for duplicating previous time entries.