Current Model Based System Engineering (MBSE) tools can only do partial safety case assurance. System engineering models provide evidence for the safety case, but they cannot provide the safety argument itself. Hence the DSM needs to refer to those models as evidence.
The DSM can also import data from Excel spreadsheets, so you can import a table of requirements that can be cited as evidence. For instance if an argument depends on the existence of a safety interlock then it can directly reference the requirement imported from DOORS, including a hyperlink to the DOORS URL.