Damned Greenhorn, I am!
I hope, I offended no religious feelings with this words, but it explains how I feel. Every step is harder then the one before and I feel like a man in a swamp.

Okay, I understod how to convert a line to shape. Thanks Intbel!
But How to make a part of the whole work to a shape, when the part is made of lines and curves?

I tried, but got this:
http://www.osnoxe.de/logo1a.jpg

How to select the one-third part of the logo to make it a shape?
I used the Shape Editor Tool. Following straight lines is okay, but how to catch the curve?

Many thanks again to you, the helpers!

Holger