You can import data from a DMN file to ARIS and use the DMN diagrams that are generated by the import in ARIS.
Procedure
Click Models and objects.
Select a group.
Click Import > Import DMN file. The Select DMN file dialog opens.
Select the DMN file and click Open. If the diagram has never been imported, the import starts immediately.
If you have already imported the same file before, the Select diagram to overwrite dialog opens, and you can decide if you want to overwrite it. Click Start import.
The Import DMN diagram dialog provides information about the result of the import.
Click OK.
You have imported a DMN diagram.