As mentioned previously there really isn't a "Save As" command because the file type hasn't changed. You can open a Structural Modeler file in ABD and use/modify it as-is since the data is forwards-compatible, but the Structural members from an ABD generated file cannot be modified within Structural Modeler since it has no understanding of that newer data which simply doesn't exist in the older product. However, you should be able to share ABD generated DGN files for coordination purposes.
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