Hi!

I like to draw "related" way, so every point and line is related with the previous point.
So how can I assing new temporatary UCS with fastest way possible? I know the
@-, but I like to specify a point where to determine the starting point
of my line.. for example. The previous software that I used had a
simple shortcutkey that resetted the coordinate as 0,0 in that point.

I also know the UCS -> make new UCS -> save it -> name it etc... but it´s too slow.
 
I hope that you can understand what I mean.

No, not entirely clear what you mean...You want to specify a "0,0" for a particular polyline or series of lines so you can use coordinate entry, that is relative to starting point?Well UCS would be the usual way for that. Would be quicker if you use just UCS>>Origin for that, don't need to save & name it.