Thanks for all the help.
Comparing these two:
http://forums.sketchucation.com/viewtopic.php?f=323&t=12668&p=92276&hilit=+Remove+inner+faces+#p91814

http://forums.sketchucation.com/viewtopic.php?f=323&t=25466

which one is the best?

@chris fullmer said:

Aquatis, are you wanting this functionality for a box modeling workflow? A plugin could be made fairly easily to re-create the pushpull tool so that it does not add internal faces when pushpulling.

Chris

Yeah. If you are offering the thing i´m thinking you are, That would be great!

@xrok1 said:

well you can't do that with push/pull and not get internal faces. you can however make your cube the full height (from image) then select the top or bottom perimeter edges and ctrl copy them up or down as many times as you wish with no internal faces being created.

Ok, thanks for the tip. the plugin worked and saved me some hours. Thanks!!!

Actually the the image showing the "wrong" way is the way i want it but without the internal face(thats how all other 3d software are extruding an surface. So probably the plugin is what im looking for.
here is an image illustrating how i want it http://piclair.com/data/uwkth.jpg
(left box)

@xrok1 said:

pressing the ctrl key will toggle the plus sign by the push/pull pointer and toggles new face versus move face. try it its hard to explain.

thats what im doing(i guess), but is there a way to make the edge around stay, while preventing the face inside the object from being created.

Hi, Is the a way to extrude (push/pull) without adding geometry inside the object?
(but still getting the edge around the place where i strated like when pressing Ctrl)

(reason is im exporting the modell)

Hi, how do i move the origin when its outside the screen? The reason im asking is that im modeling on a place quite far away from the "starting point". im using 7 images so i have to zoom out way to much for being able to se how much i need to move the origion to aligen the geometry with the new image.