You may want to try either the locate or whereis command in a terminal window first.
i.e. whereis openoffice.org 1.1.2
You may have to refine things, because it depends on EXACTLY what the openoffice 1.1.2 that you installed went in as.
As you mention that you're using mandrake 9.2, it probably came with either OOo.org 1.1.0 or 1.1.1 so you might want to go into the mandrake control centre>software management>remove (rpmdrake -) and see what it show's that's available for removal and remove the earlier version - normally you can run 2 different versions on the same machine, so by removing the earlier one, you're just freeing up some space (and possibly preventing a little confusion).
So now you are sure that you only have the 1 version installed? then try the Menudrake facility - if you can't find it from the kde start button, then try "menudrake" from a terminal.
You may find that you have to delete Office menu heading first, because previously, I've had it where my system installs OOo.org as an additional heading. Then you would have to go through the process of adding openoffice to the menu.
As I understand it, you should be able to install the individual component's if you know where the facility is located (use either whereis or locate in a terminal), you'd probably have to have the exact path for it.
Or maybe try making a desktop icon by right clicking on a free area of the desktop and then follow Create new>file>link to application you'd have to work out the best name for the icon, you should also have an icon in the icons applications place and the command (from memory) would be soffice
If none of that help's, have a look in the LQ distro's>mandrake section or check out this
link, you might find idea's or suggestions at either place!
Maybe that help's a little?