A Microsoft file hosting and synchronization service.
Dear Clancy Mullbrick,
Good day! Thank you for posting your query in our community.
Based on your description, we can know that now you have two folders in your OneDrive and you want to combine files in these two folders.
AFAIK, currently, there is no out-of-box way to meet your requirement in OneDrive. We recommend that you submit requirement for this feature in this OneDrive UserVoice and many members who has the same requirement with you will vote it in the future.
And you could also contact your Office 365 administrator in your company if you aren’t the administrator and follow the steps in the article to open a ticket, supports there have higher permission and more resources than us, they may could find an easy way to help you combine the folders quickly.
Appreciate your understanding.
Sincerely,
Jazlyn | Microsoft Community Moderator