A Data Store Reference points to a Data Store — a collection of information. A Data Store often represents IT systems, applications, databases and folders. It persists beyond the lifetime of the Process.
You can use a Data Store Reference as a source or target for a Data Association.
You can create multiple references to the same Data Store in a BPMN model.
You define the Data Store in Definitions.
You’ll find Data Store Reference attributes and other settings within the Attributes panel, under the Attributes tab.