i have a surface i made from sweep two rails, i tried curve network but i didnt get a good result near to the end of the curve but a little bump, how can i go about thissurface and curves.3dm (1.2 MB) 
Hi Mitviz - I think you could to worse than just Loft of all the curves with Rebuild set at 10 points - then trim the roundy corners - does that look at all like what you need?
surface and curves_PG.3dm (1.1 MB)
-Pascal
This can work but i need it to extend down to the ends of the lines, am trying it myself and cant get the loft to work
Here is another try - same idea.
surface and curves_PG2.3dm (119.0 KB)
-Pascal
Hi guys i cannot get surface 1 to neatly cut out of the polysurface. Can anyone help with this?surface blend.3dm (858.6 KB)
Hi Mitviz- DupBorder on the two surfaces, and then use the resulting curves to trim the larger object, then Join.
Any luck with that?
-Pascal
i think i tried that already with no luck
Here’s my try - surface blend_PG.3dm (870.4 KB)
-Pascal
Perfect Pascal but wasnt there a smoother surface in the file?
actually no, here is the right file, take a shot at thatsurface to combine.3dm (229.6 KB)
Here’s one idea- you have a sort of combination of tangent, or near tangent, and intersecting surfaces there, so cutting back and making a separate transition surface might be one way to go.
surface to combine_PG.3dm (384.3 KB)
-Pascal
Perfect idea Pascal! you are a genius!