@Wo3Dan
Thanks for your tips! This is more or less what I do normally to solve this problem, let's say the manual good old procedure. What I was wandering was if there is a way to have those edges automatically hidden.
@Dave R
I attach the very simple model I used to write this post. Of course it's only an example to explain my doubt. In real life I have this problem working wih models that are lot more complex.
I'm not expecting a way to have those edges hidden or soften during modeling, but I really would like them to disappear at least when I export to 2D graphics. I really like some of sketchup's styles and the time saved in exporting without rendering, but in models that need different solutions or phases I need so much time to hide edges and create components that this benefit is almost lost!
What I really would like is a "view option" that wuold allow me to turn those lines down to export images/videos or during presentations.. Something like the Axes and Guides settings in View menu...