To commit changes and the current state of the VM, delta disks are merged with the base disks. This operation is done using the DELETE option in the Snapshot Manager:

• DELETE: Deletes the selected snapshot from a chain, consolidating the changes that occurred between the state of the snapshot and the previous disk state to the parent snapshot.
• DELETE ALL: All snapshots are deleted from the VM, consolidating, and writing the changes occurred between snapshots and previous delta disks to the base disks, merging them with the base VM disks. DELETE ALL is an alias for committing all changes, and your virtual machine will merge everything to the base disk. The result is that the VM will have only the base disk with the current running state.