multiple elements section generation

all the best in new year mates,

i am doing sort of parametrized "old school  construction"  definition

 problem is GH oriented -how to generate sections of multimly elementes and divide them in to seperate sets.

columns beams and floor are created as separated items and has various trees.

1. in structural axis i made planes (line line) which i wnat to use to generate sections.

2. i change model elements in to flat brep to get plane/brep section

problem is that i can not put everything in one component becouse resoult is not projecting all elements -i dont know why.

how to get all my lines from different elements in one curve? because i would like then to orient it on plane?

any comments would be appreciated:)

best,

k