Everything looks pretty much good, except that you need to remove the ".prt" from your assignment. ProE just needs the name, you've already designated that it's a part by the ADD COMPONENT. Your code should look like this.
RELATIONS
IF HOLDER == "1"
COMP =...
I'm looking to see if anyone has been able to create an elliptical cone in ProE2001 and was able to get it to unfold. Let me know if more info is needed. Thanks
When you are adding an item to the family table, pick Parameter from the Family Items dialog box. Then in the Menu Manager that pops-up below, pick Feature then the hole you wish to add parameters to the table from. A list of parameters with check boxes will appear. You can do this with any hole...