The Project Management feature (Project Browser and Project Navigator) was set up with the expectation that you would have separate Construct files for each level for items specific to that floor. You can have spanning Constructs that have objects that extend beyond a single level, such as exterior Walls (especially if they are Curtain Walls) or Stairs. On larger projects, you can have Divisions that separate a level into multiple Construct files as well, if that makes sense for your workflow.
The Constructs are then brought into View files, as needed, as external references to create the model contents for a View that is put on a Sheet, and the annotation is added there.
Model views are then created from the View files, and placed on Sheet files.
The above is an oversimplification but describes the main workflow. If your design has modeled elements that repeat in a building, you can create them in an Element file, and then that file is externally referenced into one or more Construct files for each instance of the repeated elements. You can have working View files if that helps you understand the design better, as well as View files that have multiple Constructs referenced to create a source for a Schedule Table that includes all of the scheduled elements in the project. Multi-level Views are also used for building elevations and sections.
All of the external referencing is managed through the Project Navigator.
If all of that is overkill for you, you can manually break up your model into floors per level, and then manually combine them when you need multiple levels for a particular view on a sheet.
Another alternative is to model everything in one file, and then use a combination of level-specific Display Configurations and level-specific layering to get a viewport to show what you want to see on each level's plan view. @ntellery has blogged extensively about such a system that he set up for his primarily residential/small-scale commercial practice.
Yes, it is different from the workflow in Revit.
David Koch
AutoCAD Architecture and Revit User
Blog | LinkedIn
