Click
here: 
to open knee.sldprt
(or browse to <install_dir>\samples\tutorial\assemblymates\knee.sldprt).
Click
Make Assembly from Part/Assembly
(Standard
toolbar).
A new assembly document opens.
Click View, Origins to display the origin in the graphics area.
In the PropertyManager, under Options, select Graphics preview.
Move the pointer over the origin.
The pointer changes to 
, indicating the inference to the assembly origin.
Click to place the knee.
When you place a component
this way, the component
origin is located coincident with the assembly
origin, and the planes of the part and the assembly are aligned. This
procedure, while not required, helps you establish an initial orientation
for the assembly. You can create this type of inference with any component
as you add it to the assembly.
