Since you haven't explained what exactly you want I'm going to assume that you want L102 in your subassembly to daylight to the last point that it would cross the surface target EG.
BrianHailey_0-1704836970319.png
To do this, create an axillary point from P60 at the same slope that you would daylight so that it extends way beyond the limits of your surface. From that axillary point, create another axillary point that slopes to surface back along the path of the original axillary link. Now, create point P91 at that axillary point and then link L102 between point P60 and P91 and you're done.
In essence, go out beyond your surface and then daylight back, that's your last surface crossing. Now create a point there and link it to the previous point.