Frequently users want to work summary tasks with dependencies and they don't know if its possible.
Is it possible to create dependencies for summary tasks?
This is not possible in CA PPM. The system does not allow that type of configuration since in order to follow good practices, dependencies should be linked to tasks instead of summary.
If you create dependencies for summary tasks from MS Project and export to CA PPM, you will be able to see it as well in CA PPM gantt. But this way to work is not allowed and it could affect gantt functionality.