I'm trying to add a user defined feature to a solid using JLink without using the prompts Pro/E gives for placing the UDF. I can do this successfully when using Pro/E's GUI to place the part after JLink requests to add it. I am currently trying to use UDFReference and Selection classes to get the features i'm trying to add on to (the ones that I used to place the part with pro/e's gui) and then set the references to use those features in the UDFCreate instructions. Any tips or suggestions would be greatly appreciated.