It sounds like you would like to be able to edit the ODF (Organ Definition File). Unfortunately, that is not supported, and I would not be able to help you there.
The only supported method to achieve what you would like is to create a new CODM (Custom Organ Definition Module) definition.
For the ranks, they are found in the Hauptwerk/HauptwerkSampleSetsAndComponents/OrganInstallationPackages folder of your Hauptwerk installation. Each organ installs one or more data folders, coded by a unique number. Multiple installation packages of a single organ are usually sequential. To find out which folder pertains to the organ you want to code, you can look at the organ stops included. In many Sonus Paradisi sets, the organ stops can be found in the Pipe (or pipes) folder, then a folder within labelled with the manual name (eg. GO, Pos, Rec, etc.) Once you find what folder the samples are in, enter the folder of the stop you would like to sound in the Rank entry within the CODM. For releases, Sonus Paradisi saves the main release as a subfolder within the main sample folder named rel99999, the short and medium release as rel00xxx (where x is the milliseconds at which the release was recorded). You will be able to enter this information in to the "rank" portion of the CODM XML file.
For voicing, It is difficult to perfectly duplicate an ODF's voicing in a CODM. As such, I would create a CODM and hand voice it to your satisfaction afterwards (Which you could only do in Hauptwerk Advanced).