Well it is not that easy.
I have to make new lines with the
Split Poligon Tool.

And if i dont have a line close to the vertex point then the model gets messt up because when i pres delit on the vertex point i loos the lines that was connected by it.

Example

A cube
*-------*
| |
* * <---- If i reemove that point the hole line dissaperas
| |
*-------*

*= Vertex point
(Looks funny when posted i think you get the idea)

Well i will think something out.
Another question is there a hot key to snap to vertexpoints so i can get nice and good lines when i use the Split Poligon Tool?
Something simmular to gridsnap or curvsnap?