Copy Versions from one Project to Another

// Specify the master project  to get the versions form
final sourceProjectKey = 'SRC'

// Specify the key of the project to copy the version to
final destinationProjectKey = 'DST'

// Get the project versions
def versions = get("/rest/api/2/project/${sourceProjectKey}/versions")
    .header('Content-Type', 'application/json')
    .asObject(List).body as List<Map>

// Loop over each version returned and create a version in the new project
def successStatusByVersionId = versions.collectEntries { version ->
    // Copy the version and specify the destination project
    def versionCopy = version.subMap(['name', 'description', 'archived', 'released', 'startDate', 'releaseDate', 'project'])
    versionCopy['project'] = destinationProjectKey

    // Make the rest call to create the version
    logger.info("Copying the version with id '${version.id}' and name '${version.name}'")
    def createdVersionResponse = post('/rest/api/2/version')
        .header('Content-Type', 'application/json')
        .body(versionCopy)
        .asObject(Map)

    // Log out the versions copied or which failed to be copied
    if (createdVersionResponse.status == 201) {
        logger.info("Version with id '${version.id}' and name '${version.name}' copied. New id: ${createdVersionResponse.body.id}")
    } else {
        logger.warn("Failed to copy version with id '${version.id}' and name '${version.name}'. ${createdVersionResponse.status}: ${createdVersionResponse.body}")
    }

    [(version.id): (createdVersionResponse.status == 201)]
}

"Status by source version id (copied?): ${successStatusByVersionId}"