I think Data Migration,  but I if you want more advance option.

We have the export function build in the system which allow to export employee to XML file.

You could see that in the employees screen, this function will create the XML file and try to send to other system.

I can imagine that we could build similar message which will be create employee(s)  from the file which will be send by e-mail  or drop in the extended server folder.  

There are some example for Supplier Invoice etc, so I suppose this could be done to create multiple employees.  

@Les Many thanks