There are multiple ways to organize your model into Packages. The S. Friedenthal in the "Practical Guide to SysML" recommends to organize your model structure in the following ways:
By system hierarchy (e.g., system level, subsystem level, component level).
By process life cycle where each model subpackage represents a stage in the process (e.g., requirements analysis, system design).
By teams that are working on the model (e.g., Requirements Team, Integrated Product Team (IPT) 1, 2).
By the type of model elements contained in it (e.g., requirements, behavior, structure).
By model elements that are likely to change together.
By model elements organized to support reuse (e.g., model libraries).
By other logical or cohesive groupings of model elements based on defined model-partitioning criteria.
A combination of the preceding.
