how to cretate a system family (example:end cap with pipe connector)

Hi all
I need a help regarding to create a new system family in aecosim, for example if i create a new end cap cell its not a system family its just a cell if i plan to connect with pipe means i need to move, rotate and align the end cap with pipe manually, but if we use the end cap its already in the software means its automatically connect to the pipe with the single click, how to create that kind of cells kindly advise me