Grouping lines by height level

[najwan.joan.sv]

So i have a group of lines thats have different height or Z axis(its close to level elevation value), and its in random sequence, what was i trying to do is to group all the lines to close to level elevation value. and by doing so i could use family instance.byline properly

What should i do to grouping the lines?

Thanks You!

[Draxl_Andreas]

@najwan.joan.sv

you can use GroupByKey or GroupByFunction