Try with these steps:

1. Create Reusable Project(ProjectA,ProjectB), which will include Reusable sub processes(processA,processB).Make sure that the kbase and ksession configured for this project will not be default.

=============kmodule.xml=============

<kmodule xmlns="http://jboss.org/kie/6.0.0/kmodule"; xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">;

<kbase name="kbase" default="false" eventProcessingMode="stream" equalsBehavior="identity" packages="*">

<ksession name="ksession" type="stateful" default="false" clockType="realtime"/>

</kbase>

</kmodule>

=======================================

2. Create Parent Project(ProjectC), which will include Parent process, make sure that the kbase and ksession configured for this project will be default and it include kbase of ProjectA & ProjectB.

=============kmodule.xml=============

<kmodule xmlns="http://jboss.org/kie/6.0.0/kmodule"; xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">;

<kbase name="kbase-top" default="true" eventProcessingMode="stream" equalsBehavior="identity" packages="*" includes="kbase">

<ksession name="ksession-top" type="stateful" default="true" clockType="realtime"/>

</kbase>

</kmodule>

======================================

3. Edit pom.xml of this Parent project and add dependency of the ReUsable projects(ProjectA,ProjectB).

4. Alter kmodule.xml of Parent project so it includes the knowledge base of the ReUsable project - please notice the keyword "includes" in the snippet above.

Hope it helps.