The OrCAD importer utility of Multisim supports DSN files up to OrCAD 16.2. Files from a newer OrCAD version (e.g. 16.3 and higher) will likely not work as a result of file format changes made after 16.2.
Even files made in OrCAD 16.2 and prior, may import with some limitations in Multisim.
If you have files made after OrCAD 16.2, you may attempt to save the file for a previous version in OrCAD, e.g. "Save as Capture 16.2 Design (*.DSN)", this will increase the importer success rate.
For pre-sales testing, you may download the Multisim evaluation edition. This will provide you with several days of Multisim use to understand the import capabilities as it pertains to your files.
For issues with DSN files not importing correctly, or not importing at all, you may also contact Tech Support to see if it is possible to import them.
Multisim Evaluation Edition
NI Technical Support
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A valid service agreement may be required, and support options vary by country.