Under Target
Component, select 
Assem1
and rename to Crane Assembly;
select Central Arm:6:00,
and rename to Central Arm.
Create an assembly document from selected blocks.
Right-click Sketch1 and select Create Assembly from Layout Sketch.
Click OK to the message.
The Create Assembly from Layout Sketch dialog box is displayed.
In the Create Assembly from Layout sketch dialog box:
Under Create, clear both cylinders and both pistons.
This creates components for Crane Base-1, Central Arm-1, and Upper Arm-1.
Under Target
Component, select Assem1
and rename to Crane Assembly;
select Central Arm:6:00,
and rename to Central Arm.
Click OK.
An assembly document is created that includes
Crane Base, Upper
Arm, and Central Arm with
the appropriate 
Mates.
Click Zoom to
Fit 
(View
toolbar).
Save the assembly.
