Within a Workflow (JOBP), a Group object (JOBG) or a Schedule (JSCH) it is possible to select for the Children Queue "*OWN" as a value.
Please see: https://docs.automic.com/documentation/webhelp/english/AWA/12.1/DOCU/12.1/AWA%20Guides/help.htm#AWA/Objects/obj_attributes_defining.htm?Highlight=Children%20Queue
In the Automic Web Interface (AWI) this value is no longer available for selection in the drop-down list.
Due to a bug the *OWN property was not added in the child queue selection combo box. A fix was introduced to add it in the combo.
Enter the value *OWN manually in the Children Queue.
Update to a fix version listed below or a newer version if available.
Automic Web Interface (UI)
Automic Web Interface 12.1.2 - planned release date 2018-05-23