Sometimes, you might decompose a process and then decide that you want, instead, to show the detail of its sub-processes directly.
You can remove this level of decomposition by right-clicking the decomposed process symbol in the diagram or in the Browser and selecting Remove Composite Process Level in the contextual menu.
All the objects contained in the decomposed process (except any starts and ends) are moved one level up in the hierarchy, and those directly beneath the process replace the deleted process in any diagrams. Input and output flows previously connected to the old process are automatically re-linked to the first and last objects respectively from the old control flow.