Cant partition external FW disk

a. launch DU
b. see that my 240Gb ext disk is already partitioned into three volumes.
c. wish to further split 3rd volume into 3 more volumes of around 20Gb each
d. launch Help from DU
e. search on partition
f. see that at step 3 of the suggested solution "Partitioning a startup disk into several volumes" - mentions that I should be able to "click partition"
g. see that there is no button or menu to do this...
am I missing something ? btw the Help stuff mentions "partitioning a non-startup disk" as well, and the instructions dont significantly deviate from what Ive already stated....

never mind figured it out. Wrote too soon ! Have to click on the correct icon within DU. Duh.
- Still cant split the 3rd partition without erasing the whole disk, but I have Disk Studio from Macromat.

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