How to trim structural beam system to beam system boundary?

[Anonymous]

I have created a structural beam system as a way to make floorboards on an external deck. However the floor boards simply overhang the boundary of the beam system roughly and do not cut along the boundary. I have found a (slow) workaround by extending the start and end of each board by 500mm (so as to overlap the boundary) then selecting each individual board and cutting it to a reference plane that follows the beam system boundary, but is there a more efficient way?

[ennujozlagam]

the proper way is to edit your beam system boundary line. thanks

[Anonymous]

@ennujozlagam whilst that makes the beams follow the boundary (to a certain extent), what I am after is how to trim them to the boundary. To take your example: see how the I-beams just end abruptly at the boundary line rather than the boundary line cutting them nicely along the angle. I want them to be cut at the ends along the angle. 

[martijn_pater]

Why a structural beam system? Think I might do it as (structural) floor and use parts to create the boards.

[ennujozlagam]

you can use reference plane and use cut geometry > select your beam and then your reference plane. thanks