Hi!
Open up the object you intended to use as a parent object, on the page ""Initialise"" open the properties of the description box, under the tab ""Information"" you'll find the ""Shareable"" option, mark this option, close down and save the object. Now you in the new object you open up the Application Modeller Wizard and mark ""Share the application model of another object"" and go the through the wizard. You should now be able to see the elements of the parent object in the new object's Application Modeller.
Best Regards,
Joakim