i am trying to post data from one entity into another

when I am doing this get mapping I also want to post this data in another entity called bookings.java so that I can see the booked buses there. I am learning right now if my question is wrong please correct me.

this is the DashboardController.java

@RestController
@RequestMapping("/dashboard")
public class DashboardController {

@Autowired
private BusDataRepository busDataRepo;

@GetMapping("/buses")
public List<BusData> showall() {
    return busDataRepo.findAll();
}

@GetMapping("/book/{id}")
public Optional<BusData> show(@PathVariable int id) {
    return busDataRepo.findById(id);
}
}

this is BusData.java entity where i have put data through MySql

@Entity
@Data
public class BusData {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private int id;

private String filterDate;

private String toDestination;

private String fromDestination;

private Double price; 

private String BusName;

private String time;
}

this is Bookings.java entity where i want the data which i booked

@Entity
@Data
public class Bookings {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private int id;

private String filterDate;

private String toDestination;

private String fromDestination;

private String BusName;

private String time;
}