Thanks i found it, but it does not work as i expected
I want to be able to create dinamic maps using pre-made "pieces" of map that i can assemble in execution time...but i cant make these pieces with separate bsp maps, because they cant be 'open' (with holes/exits to the void) so there wouldnt be joining points between pieces.Its also hard to operate with bsp loaded maps, because the nodes have no names (ASE files have nodes named).
Its a pitty, because quake map editors are quite easier to use than 3DStudio, and in fact I only need maps (no models, no behaviour, no animations,...).
The maze3D could be a good starting point if I could improve the quality of the cells (i.e. changing cells by premade pieces of map).