Kingswaysoft - need help migrating lookup records into Multi Select optionset field

Hi,

I need some help with writing down a SSIS package using Kingswaysoft.

My onprem has a related entity on Contact form. And it has been modified into a multi-select optionset field in Online. 

Now, while migrating data, I am stuck with how to map these lookup records to multi-select optionset field. Any suggestion would be greatly appreciated.

Thanks for any help!