Multiple secundary parts in Tekla component

Hi everyone,
I need your help,
I have developed a method with grasshopper to put the Tekla profiles of a bridge and I want to insert custom Tekla components with grasshopper.
This component needs 1 main part and 3 secondary parts.
I don’t know how to include multiple secundary parts in the component so that when grasshopper runs the component, it runs each time using one main part and 3 secundary parts?
Thank you very much in advance.