Is there any easy way to determine key-ins or variable names in various parts of MicroStation?
Yes, you can record a MicroStation VBA macro while you perform a specific operation (e.g. open a dialog, click on a tool button, adjust settings, etc.)
When completed, you can edit the resulting VBA code to see what key-ins and/or variable settings were recorded.
https://communities.bentley.com/products/microstation/w/microstation__wiki/8775/getting-started-with-visual-basic?pi26718=2