Using the software

I have created a custom connection for a column and a beam. As you can see in the picture that i've uploaded there is a small part of a beam in the custom connection. The problem is that everytime i use this component and i pick the main and the secondary part, the beam doesnt cut itself and i have to use the fit part end tool, which is very inconvenient to do for every column-beam connection. Is there a way to make the beam cut itself automaticaly? And the second and final problem is that when i add that connection i want a 10 mm empty space between the beam and the small beam from the custom connection to be added automaticaly. Is there a way to do this? Or i have to manually cut the beam 10 mm from each side? (the first picture has the custom component highlighted) Thank you in advance.