D5 Render provides several ways to duplicate scene assets.
Shift + Coordinate Axis
You can copy the model in the specified direction by first holding down shift and then clicking on an axis in any direction.
Ctrl+D
When copying using the shortcut Ctrl+D, materials of models are associated with each other by default. That is, the material on either model is adjusted, and the other model also changes.
Alt+D
If you do not want material association, use Alt+D to duplicate.