Connecting two split curves with two lines

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 (16.9 KB)

Take a look at the attachment.

Support (22.6 KB)

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

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