To undo an operation (unsplit, unmerge, unreplace, etc):

1. Start network editing by clicking the Start Spatial Edits button and selecting the network layer to be edited.
2. After performing an operation that you wish to undo, click the Edit Datum button .
3. Click the element that you performed the unwanted operation on and click the Undo button from the radial context menu.
4. The Undo dialog opens, detailing the operation that was just undone. Click the Undo button to finalize the Undo.