So far my work like this.
I don’t see a reason for that cut you made there. Can you explain why you did it?
Hai Calandro thanks for the asking. the pink line is crease I think to make effect like hard edge for the model I can use crease. I really confuse here. So I ask to the community.
I know, but you made a cut there and ended with a triangle at the end. That will create artifacts.
The way I would approach this would be by making a simple extrusion. Using the same faces, without cuts.
Ah I See. I want to make double rounded there. top and bottom part. and this still use quad
I want to make this part.
Thanks Calandro would love to try the way you make it here. Thanks for sharing 
Of course, you might need some extra loop cuts to adjust the shape you want, but you will be free of the artifacts.
Here I used the crease on the inner side and added a loop cut in the middle part to adjust the curve.
Hai Calandro. I:ve tried your solution but still have shading issue on here.
on this area, any recomendation way?
I think it’s better to follow the shape of the curve for the topology, especially if you’re using subdivision
something similar to this
*edit: don’t mind the sketch on the front window, i didn’t realize that it is a sharp corner not a rounded one.
will try this. Thanks in advance man.
NP, don’t forget that it is just a quick rough sketch, but hopefully, it won’t be that far different.
Ah I see use bevel and with weight bevel limit. yup yup thanks man. For the alt approach.
