As a plugin developer you can use this plugin as dependency of your plugin by adding a dependency tag to your POM.
To add the latest version of this plugin as a maven dependency, use the following:
<dependency>
    <groupId>org.jenkins-ci.plugins</groupId>
    <artifactId>jenkins-multijob-plugin</artifactId>
    <version>662.vd2e0001f6b_b_d</version>
</dependency>