[Orgmode] How to get a clock table without the file level?

[Peter Frings]

Sorry for the repost (original of 8/8), but I have been looking for an  
answer in the manual, as well as in the sources and I really don't  
dare to touch anything down there...


Is it possible to build a clocktable with the agenda as scope, but  
summing up all times per headline level, and not per file. Some files  
have the same level 1 entries, and these should be summed up.

E.g.:

A.org:
* REQD
** task 1
** task 2

B.org:
* Todo
** task 1

C.org:
* REQD
* task 3


The current clocktable create blocks per file:

#+BEGIN: clocktable :maxlevel 4  :scope agenda :block thisweek :step  
week

Weekly report starting on: <2008-08-04 Mon>
| File  | L | Headline            | Time   |      |
|-------+---+---------------------+--------+------|
|       |   | *Total time*        | *0:40* |      |
|-------+---+---------------------+--------+------|
| A.org |   | *File time*         | *0:10* |      |
| A.org | 1 | REQD                | 0:10   |      |
| A.org | 2 | task 1              |        | 0:05 |
| A.org | 2 | task 2              |        | 0:05 |
|-------+---+---------------------+--------+------|
| B.org |   | *File time*         | *0:15* |      |
| B.org | 1 | Todo                | 0:15   |      |
| B.org | 2 | task 1     |        | 0:15 |
|-------+---+---------------------+--------+------|
| C.org |   | *File time*         | *0:15* |      |
| C.org | 1 | REQD                | 0:15   |      |
| C.org | 2 | task 3              |        | 0:15 |
#+END:


It would be very convenient if I could group it on the first level,  
across the files:
#+BEGIN: clocktable :maxlevel 4  :scope agenda :block thisweek :step  
week

Weekly report starting on: <2008-08-04 Mon>

| File  | L | Headline            | Time   |      |
|-------+---+---------------------+--------+------|
|       |   | *Total time*        | *0:40* |      |
|-------+---+---------------------+--------+------|
| A.org | 1 | REQD                | 0:25   |      |
| A.org | 2 | task 1              |        | 0:05 |
| A.org | 2 | task 2              |        | 0:05 |
| C.org | 2 | task 3              |        | 0:15 |
|-------+---+---------------------+--------+------|
| B.org | 1 | Todo                | 0:15   |      |
| B.org | 2 | task 1              |        | 0:15 |
#+END

Another possible method is to use categories at the file header, and  
to group files with the same category. That way, you can control which  
files to group and which ones not.


Maybe I have overlooked some customization somewhere, but I couldn't  
find it in the manual. And as I said before, I'm loosing my way in the  
source files...


Any pointers? Or suggestions to tackle this in another way?

Cheers,
Peter.

PS: this is the first time in my life I'm getting organized... thanks  
to org-mode!