Making a pop up list to select model and the part is created automatically

[airmylest]

I am trying to make a program to allow a pop up to appear when the assembly(lets call it CSD) is placed from vault into another assembly. I want it to ask what conveyor model it will be going on and once that information is selected, the CSD corrects the size of the door. I cant have it link back to the CSD once its brought into the new assembly, because this main CSD will be going on several different conveyors so I cant having it changing on all of them. It would also be preferred to not have to use "Save As" every time. So far I have tried using linked parameters and making a form that with the help of iLogic, the user can select what conveyor model. That worked but it was linked back to the CSD. Right now I am using "Components.Add" in my code, linking it to files in the vault. It will work, but it is linked to a multivalue text parameter in CSD so when I "Place from Vault" and use linked parameters, it does not allow me to select which model I want. I am unsure of what else to try. Any help would be greatly appreciated!