While you always the option to add more places to an existing study, there may be times where you will need to duplicate or make a copy of an existing study. First, log in to Prolific, select the study you wish to make a copy of, then from the Action button, select "Duplicate".
The new study will share all the properties of the parent study including the completion URL and prescreening criteria. In addition, the duplicate study will have the appropriate study exclusion prescreening criteria automatically added to it to prevent participants from the parent study from taking the duplicate child study.