Overview - BPMN Chart - Shape Morphing
Each shape in a BPMN chart can be changed or morphed into another. The system is flexible enough to allow for easy transition as you are creating your BPMN model.
To change a shape to another type (morphing), simply open the context menu on the shape you want to change and select the new shape type. The chart will update with this change and all connections should remain in tact.