PowerDesigner supports both single-assembly and multi-assembly models. By default, when you create a Visual Basic 2005 OOM, the model itself represents an assembly.
In the top-level diagram, insert a type or a namespace. The model will default to a single-module assembly, with the model root representing the assembly.
In the top-level diagram, insert an assembly in any of the following ways:
Note that, if these options are not available to you, then you are currently working with a single-assembly model. See Converting a single-assembly model to a multi-assembly model.
The model will default to a multimodule assembly, with each assembly represented by a standard UML package symbol, and appearing directly below the model in the Browser tree.