Use a Box node (

) to split geometric entities of an imported mesh by creating at least one new geometric entity for the elements enclosed in the specified box.
To add a Box node, right-click a 2D or 3D mesh node and select Box from the
Partitions menu. Then use the following sections to specify the geometric entities to split, the properties of the box, and the split condition:
Use the Include element if box contains list to select the condition for which an element is enclosed in the specified box. Choose
All vertices to consider an element to be enclosed in the specified box if all element vertices are enclosed, or choose
Some vertex to consider it enclosed if at least one element vertex is enclosed.