Daylight foreslope width issue.

[therock005]

Introductory question
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The slope after the should and till the existing ground is the daylight slope right?

Y is it called like that?

The real question
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Anyway,in setting a basiccutfillslope i dont know the foreslope width cause every time is dynamic based on some criteria.How can i set the criteria which in my case are:

The lower part of the basic lane the (bottom of the width) extends till it reaches the daylight slope,and in that point of intersction the slope continues a vertical distance of .40m and that concludes the slope width.

I hope i made it compehensible enough.

[therock005]

Here's a picture in case what i said is complicated.