Sequential vs. Parallel is determined by the number of processes in the queue.  If you only have one process, it will run sequentially.  Anything higher, jobs will get picked up in parallel.

Hi @Adarsh 

In batch queue configuration you need to create a new batch queue. You can call it e.g. Migration. After it you need to have following procedure located in the batch queue: Intface_Header_API.Start_Migration_Batch_
The controlls that the migration you start in background are handled by this queue
Check also that the mentioned procedure is not included in any other queue like e.g. the standard queue

For migration queue you can set the number of processes higher then 1. Processes = 2 means for example that two jobs can run at the same time in the queue

But be aware of jobs that must be executed in sequence. When such jobs are running in parallel you could get error messsages due to missing data.