Well on your image attached to your question that's how he understands it.
In any case if you want it centered; you just have to create a dot in the middle of your axis and do the same as explained in my little tutorial or SolidWorks 2016 attachment
So you want a plane that is perpendicular to the plane of the sketch and that passes through the construction line ("the inclined axis"). We must therefore select the plane of the sketch as the first reference with the perpendicular option and the axis as the second reference.
On this sketch, make a vertical construction line constrained on the origin. Then a second perpendicular that you dimension with respect to the origin so that you can move it more easily later, up or down.
Create a plane by selecting the horizontal line, select the second reference plane and put the angle that will allow you to tilt your plane as you want as in your drawing
Validate and from there you can drag this plane up or down by changing the 2° .
From this plan you make your sketches as you wish to do your smoothing later