Clone a Work Item and Link To It

def workItemKey = 'WorkItemKeyHere'

def sourceWorkItem = WorkItems.getByKey(workItemKey)

def space = sourceWorkItem.getSpaceObject()

def workType = sourceWorkItem.getWorkType()

def clonedWorkItem = WorkItems.create(space.key, workType.name) {
    summary = sourceWorkItem.summary
    description = sourceWorkItem.description
}

// Change link type name below if you do not want to use the clones link type
clonedWorkItem.link("clones", sourceWorkItem)