(Holy Win Sword) How to make this?

[micheus]

micheus it's just what I needed
I must admit I do not understand this quickly, but is perfect the help
At the moment I'm a little confused with the interceptions

In Vertex mode the [LMB] option is the most useful option and also less confused. You just need to try some times to understand how it works - it's simple. You select the vertice/vertices you want to move in order to intersect a plane, then you need to define the direction in which that/those vertices will be moved and the last parameter is the plane of intersection. This plane doesn't need to be a face or something like that - that is why is why when Wings3D requires you to pick a plane you can select a vertex, an edge or face (or a set of then). A plane in this case is defined by the [plane] normal vector you see during the process.
It's more complicated to write than to execute the steps.

For Edge mode the [RMB] option is the most useful and similar to one above, except by the fact the edge already indicate the direction.

Sometimes is difficult to find good information about Wings3D's commands, but people forget about the puzzledpaul's tutorials. You can check this one: Vert / Edge Intersect, and then go back to Main Page - there are a lot of information on it.
For 3D stuff, even having a good documentation, anyone only learn if having practice.