When the Multiple Copies toggle is disabled, then the assembly is simply transformed to the new location, without retaining a copy of the assembly at the original location. You can enable the Multiple Copies toggle to enable multiple copies of an assembly to be made during the transformation. It should be noted that this section is not available for Scale Transformations.

In general, the multiple copies will be evenly spaced throughout the transformation. For rotational transformations copies will appear at evenly spaced angles, while for translational transformations copies will appear at evenly spaced intervals along the vector describing the translation. For example, if you have a mesh for a single blade passage, you can make copies of it using the rotation transformation. If your full machine has 60 blades and you want to reproduce the full geometry, you should use the Full Circle option for the Angle and select to make 59 copies (the original copy is the 60^th).