Hello Christina
I doubt whether the table splitting files generated by SWPM will be recognized by the DMO option of the SUM tool.
If you are using the DMO option of the SUM tool to migrate and upgrade the SAP system then I suggest you to read this article to understand how the DMO works.
According to the above article, once the shadow repository has been created and migrated to the HANA database (using R3load) the source is shutdown and the application data is exported from the source and imported to the target system using R3load simultaneously without creating an export dump.
There is a also a file mode option and for that you may read this article.
As I haven't used the DMO yet I would ask for clarification from Boris Rubarth on this.
Regards
RB