How to select all Concrete Wall, Concrete Slab, Concrete Column, Concrete Beam in one DGN file using keyin?
You can use the explorer to select elements based on your requirements. If you want to select multiple element types, Ctrl+Select will work.
Please see the screenshot below:
Hope this helps.
I'm interested in using key-in, not a mouse.
If you create a Criteria Set with the Select By Attributes tool ahead of time; using level, Family/Part or whichever attributes apply; you can then record the steps of opening the Select By Attributes tool, choosing the Criteria Set and clicking on the Apply button using the Macro Recorder. Doing this will both give you the keyins used for each step, but also a macro that can you use as-is.