Extend curves

Hello guys!

I want to extend my brep by 1.5m so I thought to extend curves and work with start-end points in order to create two polylines and loft them. My problem is that polylines cause me problem due to the difference in continuity of the points. Any idea how can I fix it.

Maybe I didn’t explain my problem very well and sorry for that but I hope you will understand it
Thanks in advance!

extend curves.gh (67.2 KB)

If you set up and organize your definition well from the beginning, you don’t have to do this afterward…

extend curves_re.gh (65.8 KB)

Thank you very much HS_Kim!!