Once you have created your panel mock-up in the skeleton file, you are now ready to create components in an assembly with Inventor.

Select the Manage tab on the ribbon and click on Create Components.

Select the bodies that you are going to create parts with for the assembly and specify the assembly name as well as where you are going to save the parts and assembly.

The next dialogue box allows you to change the names of the bodies that were automatically created when you created your panels with Woodwork for Inventor.   Once this is done you can click on apply or ok.  The parts and assembly are created.

The parts are placed into the assembly and grounded.

If you change or add any more bodies in the skeleton file you are able to update the assembly.  To do this follow the same procedure as before.  Select the Manage tab, click on add components.  Select the additional bodies that you created.  Select the Target assembly location button pictured below and select No on he create dialogue box that pops up.   On the next dialogue box modify the body name and then click on OK. This allows you to select the assembly that you want to update and insert the additional panel/shelf that you have just created.   Once done you are now ready to assign materials and get out some designs for the manufacturing process.