Can one company get multilple Ms365 tenets, to keep data different with different domains?

@gmimaster Thanks for posting in our Q&A. For this issue, it is not related to windows 365. Multi-tenant issue is more related to Microsoft 365.

Based on my research, I find an official article about Multi-tenant management. Hope it will give you some ideas.
https://video2.skills-academy.com/en-us/microsoft-365/admin/multi-tenant/manage?view=o365-worldwide

If you still has some concerns, to get accurate help, it is suggested contact Microsoft 365 support. Here is the support link:
https://video2.skills-academy.com/en-us/microsoft-365/admin/get-help-support?view=o365-worldwide

Thanks for understanding and hope it will help.

If the answer is the right solution, 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.