Perform Manual Refinement
Use the Refine: Manual tool to refine elements manually.
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                From the Elements ribbon, click the Refine > Manual tool.
                 
 Figure 1.
- Optional: 
                On the guide bar, click  to define refinement
                    options. to define refinement
                    options.
- Choose FE Edges, Elements, or Nodes using the Refine selector on the guide bar.
- 
                Select entities.
                A preview of the split pattern displays when hovering the mouse over the entity and after selecting the entities. The split pattern depends on the edge count and the split pattern that applies to the given selection.If Adjacent element layers are specified, adjacent entities are automatically selected and previewed. As additional entities are selected, the preview of selected entities updates accordingly. 
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                Click  on the guide bar or microdialog to finalize the split. on the guide bar or microdialog to finalize the split.