You can copy a vacancy via the following steps:
Go to Recruitment
Click on the Vacancies tab
Click on Actions for the relevant vacancy and select Copy Vacancy
The menu option required:
Create vacancy copy (Web Services)
Menu ID:
WS_RECRUITMENT_MENU.POST_VACANCY_COPY
Related Article: PeopleXD: How to assign a Menu Option
Note: The Copy Vacancy option will be available for all vacancies only if the cp_using_volcanic_erec parameter is enabled (Y). To do this follow the steps:
Go to Administrator Dashboard
On the Site Manager widget click Admin Settings
Search for cp_using_volcanic_erec and change its value from N to Y