There are two possible options to set up DNS servers: One is to put each named to a different DNS box, the other one is to put all nameds to all box. The latter option will require a so-called 'single-dns' script that can be obtained from support@psoft.net. For more details, click here. To add more H-Sphere DNS boxes, go through the following steps:

1. Configure servers that you would like to add as H-Sphere DNS boxes;
2. Add these servers to HSphere's physical servers configuration;
3. Add them to H-Sphere's logical servers configuration;
4. Switch the Allow signup feature on for each server to enable users' signup.