Modify data structure to accomodate drag feature

[
  {
    header: headerName, // Graveyard, Leads, Applied, ...
    headerId: headerId,
    subTasks: [
                          { id: taskId, name: companyName },
                          { id: taskId, name: companyName },
                          { id: taskId, name: companyName }
                      ]
  }
]