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It is common practice in AutoCAD Map 3D to attach a set of DWG files and then make a query to display only a subset of the objects in those drawings. For example, you might have 10 drawings that contain all of the infrastructure for a town or small city. If you want to work on the water lines, valves, and hydrants, you can make a property query to display just the layers that contain those objects. The property in this case is the layer. Alternatively, you can make a location query to display just the objects within a specific area of the map. Or you can combine location and property queries to display an even more specific set of objects.
That is how it works if you have all of your data in DWG files. But what if you have all of your data in a spatial data store, such as SDF, SHP, or Oracle? You can still query from multiple data stores. All you have to do is select the layers you want to query in Display Manager, select Query to Filter Data, and then use the Expression Builder to create the query.