Command before parallelism

Build Environment
1

Hi, I’m setting up autotest integration with testrail. Our tests run in 4 threads, but before paralleling I need to create a testrun and then transfer it to a cucumber testrun id. How to run a command that executes once before paralleling?

2

Use a workflow, and hand data between jobs using a workspace or cache.
https://circleci.com/docs/2.0/caching/
Where Job A is create a testrun and then transfer it to a cucumber testrun id and Job B1 is tests run

                 +---> Job B1
                 |
      Job A +----+---> Job B2
                 |
                 +---> Job B3
                 |
                 +---> Job B4
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