Tom,
You can achieve nearly what you want. Make the wall section with the section tool. Then the details can be added to it. The wall section will have to be referenced in the building section with a symbol since the section tool cannot use multiple references the way the detail tool can. You end up with dummy references either way but at least with this approach all the drawings are derived from the model.
Another way to do this Is to set up the wall section (this also works with enlarged plans) as a view in the building section itself by using different layers for the annotations at different scales. You can place a fill in the larger scale annotation layer to mask the areas outside the desired drawing and place the notes etc on top of the fill. I use a special library part that frames and titles the enlarged drawing and converts to a reference marker at the smaller scale.
Without this tool I think the latter method is too much trouble, and despite having this fancy library part I am switching to the former approach. I haven't had to decide what to do about enlarged plans and plan details yet, but I'll probably make them into separate details since we probably will have little need to reference the plan details in the enlarged plans.
On the larger topic of details within details (and section references within sections and so on) I think that these would be desirable features. I don't think that these should be original (source view) detail or section markers however. It seems that this would create a regression problem. (How many details deep can you go?) I suspect that the programming problems would be considerable. It seems more important to be able to reference any type of drawing in any type of drawing and keep the source views to the present limitations.
Does anyone have an example where this would be a problem?
Related to this subject is the topic I started in the wish list called "The new working environment" (
http://archicad-talk.graphisoft.com/viewtopic.php?t=864
). If my proposal there to create multiple plan views were adopted along with the universal ability to reference any drawing type in any drawing type, we would be coming very close to fully automated drawing coordination. These features together would also provide a complete, clear and consistent set of procedures for all drawings without any of the work arounds.
I mention this just because I feel that we need to keep the big picture in mind and look for ways to make the work arounds unnecessary rather than making them easier.
