Connecting two split curves with two lines

Grasshopper
1

Hi, i have a problem to connect two curves, they are have to split on a split points on an other curve. I want a new closed curve and then a new extrusion. I hope someone can help me :slight_smile:
Support Podest.gh (16.9 KB)

2

Take a look at the attachment.

Canvas%20at%2016%3B40%3B25
Canvas at 16;40;25.png1766×477 180 KB

Support Podest_re.gh (22.6 KB)

3

Perfect thank you HS_Kim, so fast so perfect:sunglasses:

4

Sorry one question, how it works as a polyline not as a spline?