there is a way to split always by Z0 ? Like if always there’s be a plane for split? like mirror by 0 .
Hi @HEEN, you can split and enter _InfinitePlane or IP when the _Split command asks for the cutter to split with. I use below macro for splitting pre-selected objects with the WorldXY plane:
! _Split _InfinitePlane _WorldXY _Enter
_
c.
I tried but i need to type always ip, and select the plane world o any option.
another simple option exists ? 
Hi @HEEN,
you’ll need to put the macro into a new button to run it without typing anything. Below shows how i run it from the Macro Editor in Rhino 7. Note that i pre-select the objects:
_
c.
ohhh I see thanks!!!