Deciding when to use the Partition toolset depends on how you will use the resulting regions, as described in the following list:
Partitioning parts
Use the Partition toolset in the Part or Property module to divide a part into regions. You might use the resulting regions in the Property module to apply section definitions, which include cross-sectional geometry information as well as material property information. Partitions created in the Part module and Property module are associated with the part and are available in every instance of the part in the assembly; however, you cannot modify or delete the partitions in a part instance.
Partitioning the assembly
Use the Partition toolset in the assembly-related modules to divide the part instances in the assembly into regions. You might use the resulting regions to do the following:
Apply loads, boundary conditions, and predefined fields to regions.
Associate an output request with regions.
Gain finer control over the meshing process by adding internal edges that can be seeded.
Subdivide complex three-dimensional regions into simpler regions that the automatic mesh generator can mesh.