How to connect surface, beam in different elevation height

Hi, I have a system including rectangular surface panel at top height, below is a beam parallel with the long side of rectangular, again below this beam is another beam perpendicular with the beam in the middle layer. all these 3 elements has a gap between in height. my question is how should i connect them each other? all the cross sections are user defined, so eccentric reference point may not be possible. could anyone help me?

Hi Wenhua.Peng,

custom cross-sections can also be defined eccentrically (see the other post). This allows all elements to be defined on the same level. If that doesn’t help, please post what you want to define in a sketch.