Incremental meshing gives you more flexibility in refining meshes of individual components inside a large assembly. By remeshing only the selected solid or shell bodies instead of the entire assembly, you save computation time.
Incremental meshing allows you to mesh components individually without having to mesh the whole assembly. If you meshed some (but not all) bodies of an assembly before you run the study, only the bodies with no mesh will be meshed.
When meshing fails for certain components, you can remesh only the failed components. The existing mesh for the rest of components remains intact.
For bodies that have no mesh, right-click the selected bodies, and select Create Mesh. Apply the mesh settings in the Mesh Control PropertyManager. Bodies that failed to mesh are flagged with a red mesh icon in the study tree 
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For bodies with mesh, right-click the selected bodies and select Remesh. The new mesh control settings override the existing mesh.
Incremental meshing is not available for beams and 2D simplification studies.