Thanks for your fast replies.

@Pilou: resizr looks like a really useful tool. Thanks for that. Tried it on the original message. Worked for scaling the pictures, but I did not manage to adjust the link right. Next time on the next post.

@Michael: Thanks for the explanation. I understood, what I am doing wrong. Really looking forward to that organizing methods like grouping and instancing. Would really help me a lot.

Getting all those pieces selected before I move them sounds easy, but right now it isn´t because there are so many. I am already working with names for objects and styles.

Looks like I have to find a better workaround. My mistake in the firstplace was to give the "helping curves" which I use for extrusion etc. a different color. They must have the same color as the object, so when I select this style I get all objects. When I don´t want to work on the curves I have to deselect them on the types menu. Hope this will do the job better.

Philip