You may find that you begin by designing a single-module assembly and then need to convert your design to accomodate a multi-module assembly.
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Right-click the Browser entry for the single-assembly model and select Convert to Multi-Assembly Model from the contextual menu.
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The Create an Assembly dialog box will open, inviting you to enter a name for the assembly that will contain all the types in your model. Enter a name and then click OK.
PowerDesigner converts the single-assembly model into a multi-assembly model by inserting a new assembly directly beneath the model root to contain all the types present in the model. You can add new assemblies as necessary but only as direct children of the model root.
For general information about creating objects, see the Objects chapter in the Core Features Guide.