To create tetrahedral elements

1. Click (Mesh tab > Mesh panel > Create Tetras).
2. Enter the Node 1 or select it on the model.
3. Enter the Node 2 or select it on the model.
4. Enter the Node 3 or select it on the model.
5. Enter the Node 4 or select it on the model.
6. Optional: Select Inherit properties from neighbors if the tetra is to be created with the same properties as the neighboring elements.
   
7. Click Apply. The Tetra will be created using the four specified nodes.