When you use the Import command to import geometry into a scene that already contains geometry, in most cases 3ds Max opens a dialog that asks whether you want the imported geometry to be added to the scene, or to replace the scene entirely.
For example:
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Merge objects with current scene
Merges imported data with the current scene.
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Completely replace current scene
Completely replaces the current scene with the imported data.
Typically, once you click OK, 3ds Max opens a second dialog with geometry-specific options, as described in the topics that follow. For some geometry formats, only one dialog appears, and these options are merged with the geometry-specific options.