As far as we know, cdr to des conversion is something you can do only using CorelDraw Graphics suite. This represents transformation of Corel graphics files (.cdr) to Corel Designer technical illustrations (.des). It does not seem to be possible to achieve cdr to des conversion by other means.
Convert CorelDRAW vector or bitmap graphics to Corel Designer technical illustration.
We found one software available in the database for this conversion.
Microsoft Windows software - convert cdr to des on Windows
A set of applications used by professional graphic designers
Convert from cdr file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.