If needed, you can remove existing control numbers from all or some of the parts. Do not remove control numbers unless you are absolutely sure that they are no longer needed.
Removing of control numbers is different than reassigning of control numbers. If you only want to reassign new control numbers to parts that already have control numbers, use the Renumber option in the Create control numbers dialog box.
Double-click the part to open the part properties dialog box.
Click User-defined attributes...
The current control numberuser-defined attribute of an assembly or a cast unit that identifies the assembly or cast unit main part
A control number does not affect numbering.
Control numbers are running numbers.
of the part is displayed on the Parameters tab, next to the Control Number box. For example: