It may be possible that DAZ Studio 3D graphics software can simply resave RDS format to DBC. Other than that, there is no other way how else to perform RDS to DBC conversion.
Convert Ray Dream 3D animation file to DAZ Studio brick camera file.
We found 2 software records in the database related to .rds to .dbc file format conversion.
Microsoft Windows software - convert rds to dbc on Windows
A 3D animation software
Convert from rds file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned rds to dbc. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
Apple macOS / Mac OS X software - convert rds to dbc on OS X
A Mac version of the popular modeling tool