Just to clarify for other readers. In order for you to know if a job is standalone it would not have any predecessors or any successors. It may or may not have a start time.
I think the easiest way is to use the ESP Workstation. Download the appl and look for jobs that don't have any lines to them. They are usually grouped together.
I am not sure what the goal is in removing the standalone jobs. I always think it is best to group all the jobs for an application together. For example all of Payroll should be in the same appl.