i want to create a surface made of 4 adaptive points in revit, but i want this surface to offset from those point in Z direction and on X axis or Y axis

[OFHACHEM]

Basically the title says it all, i am creating a 4 points adaptive family where i want the surface to offset from those points in the Z axis and also most importantly outside the border of those points in the Y or X axis, here is a picture explaining exactly the offset.

Z axis offset is easily done and internal offset is easily done, but i want the offset outside the border of those 4 points. 

[OFHACHEM]

I LOVE YOU. Can you please explain the process ?

@ToanDN 

[ToanDN]

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@OFHACHEM wrote:

I LOVE YOU. Can you please explain the process ?

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The process is pretty much the same as I said earlier, but you create a line-through-points (to re-orient the ref plane) before adding the next point.

[OFHACHEM]

So the host is now the ref line plane, if I understood correctly? 
thank you @ToanDN @barthbradley  you are both amazing 

[ToanDN]

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@OFHACHEM wrote:

So the host is now the ref line plane, if I understood correctly? 
thank you @ToanDN @barthbradley  you are both amazing 

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No.  The host is still on the ref point.  Just the ref points planes are reoriented after you creating the spline from them.  

[OFHACHEM]

Understood. I did not think of that thank you so much for the help