This article shows how to set a project in local sync based on the source issue project picker custom field value.
You can set the issue project based on the custom field value from the source issue. This works for local synchronization only.
Below you can find an example configuration on how to set the target issue project, based on the source issue custom field value.
def jProject = issue.customFields."Source Project Picker".value replica.customFields."Project picker CF name" = jProject ? nodeHelper.getProject(jProject.key) : null
def exaProject = replica.customKeys."Project picker CF name" issue.projectKey = exaProject?.key