Hi room! thank your for your replay in advance.
Is there any trick to create a path with a profile like in illustrator, my goal is to take one path line and turned it into a stroke with different widths. Is there any width tool ? thanks

You could use PowerStroke or Pattern-along-Path directly. Or you can use the 'shape' option for the Pen/Bézier tool and the Pencil tool. This will apply a 'brush' to the path you draw, which you can later modify.

Usage instructions:
http://write.flossmanuals.net/start-wit ... ncil-tool/ (work in progress)
http://tavmjong.free.fr/INKSCAPE/MANUAL ... ating.html (description of shape option)

https://forum.inkscapecommunity.com/ind ... opic=626.0 Some of the same people work on both forums.