It is nothing to do with SMC SAS Management Console.
Most likely you are having a scheduler activated (LSF). Within a scheduler you are building flows (named) having some Job's.
When a flow as been defined in the scheduler you cannot add another with the same name.
Did they provide you with the scheduler concepts? Scheduling in SAS(R) 9.4 (What Is the Schedule Manager?)
Scheduling in SAS(R) 9.4 (Creating a Flow)
---->-- ja karman --<-----