Jenkins - passing variables between jobs?

You can use Parameterized Trigger Plugin which will let you pass parameters from one task to another.

You need also add this parameter you passed from upstream in downstream.

1.Post-Build Actions > Select ”Trigger parameterized build on other projects”

2.Enter the environment variable with value.Value can also be Jenkins Build Parameters.

Detailed steps can be seen here :-

https://itisatechiesworld.wordpress.com/jenkins-related-articles/jenkins-configuration/jenkins-passing-a-parameter-from-one-job-to-another/

Hope it's helpful :)