Which editor are you using?
In jbpm5 you have 2 different types of sub-processes: embedded sub-processes and reusable sub-processes. You case is the later.
Please take a look at this test that uses reusable sub-processes:
https://github.com/esteban-aliverti/JBPM-Samples/tree/master/Simple-SubProcess-Sample
more precisely:
https://github.com/esteban-aliverti/JBPM-Samples/blob/master/Simple-SubProcess-Sample/src/test/resources/process/reusableSubProcess-Parent.bpmn
and
https://github.com/esteban-aliverti/JBPM-Samples/blob/master/Simple-SubProcess-Sample/src/test/resources/process/reusableSubProcess-Child.bpmn
Best,
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