The undo and redo options that appear in the Undo section of the Edit Mesh and Create Bottom-Up Mesh dialog boxes are specific to the selected part, part instance, or assembly. When you switch to a different item and edit its mesh, the undo options change to reflect the history of the selected item. Abaqus/CAE updates the state of the buttons and their descriptions to reflect the history of the newly selected part, part instance, or assembly.
To undo or redo an Edit Mesh or bottom-up meshing operation:
Enter the Mesh module.
From the main menu bar, select Mesh
Edit.
Abaqus/CAE displays the Edit Mesh dialog box.
Tip:
You can also display the Edit Mesh dialog box using the 
tool, located at the bottom of the Mesh module toolbox.
The Undo section of this dialog box includes the Undo and Redo buttons and next to each button descriptions of the mesh editing action that will be undone or redone when you click it.
Click Undo to undo the indicated mesh editing operation or click Redo to redo the indicated mesh editing operation.
Abaqus/CAE performs the indicated change.
Continue editing the mesh or undoing or redoing changes; close the Edit Mesh dialog box when you are done.
Note: When you perform a new mesh editing operation, or any other operation that alters the mesh , any redo information about the affected part or part instance will be lost. Undo and redo information is also deleted if you delete a region mesh, apply top-down meshing, or add partitions if the added partitions require part of the mesh to be deleted.
