The Copy in Place tool creates a copy of the selected path but does not allow you to move it. This is actually
useful if you don’t want to accidentally shift the copy when using one of the other Transformation tools with the
“Create Copy” 
option enabled.
Why would
you want to do this? Well, you might want to do something like change the Paint Attributes of the top copy to add what
appears to be another paint layer on top of the original path. Paint Layers are limited to three. Here’s an example of Copy In-Place.