Hello,
Are you needing to create additional companies or looking to break up one company's general ledger into different departments, for example?
In either case you will want to make sure and go to the Company Information window (you can use the search icon inside D365 for Financials and type in Company Information) and make sure your User Experience is set to Suite at the bottom of this window.
Once your User Experience is set to Suite, then you can go to the Companies window and create a new company and/or you can set up Global Dimensions which will allow you to break down the chart of accounts to departments for example. Here's some documentation on Dimensions to review and see if this is what you are looking for: docs.microsoft.com/.../finance-setup-dimensions
Please let us know if you are looking for different functionality and we can see if there is something available inside Dynamics 365 for Financials to help with what you are looking for.
Regards,
Jennifer Reinhardt
Please see our Dynamics 365 Financials Support Team Blog for helpful information:
blogs.msdn.microsoft.com/dyn365finsupport