It is necessary to have a Dimensions project as Dimensions CM will require this for the creation of a build configuration. You should select or create a Dimensions project to receive the targets defined in the Ant buildfile.
If you do not already have source files archived in Dimensions, use the structure defined in the Ant buildfile to set up your source directories under the project.
See the Serena Dimensions CM User’s Guide for instructions on creating a Dimensions project.