
We suggest you take it as two migration projects, currently, SharePoint Migration Tool (SPMT) will help us migrate content from on-premises SharePoint sites to Microsoft 365.
However, Cascade CMS is a third-party platform and we are not able to provide support on any third-party tools. So I would suggest you seek help from third-party suppliers.
Thanks for your understanding and support.
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.