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Or just do a Staged migration? Which Exchange server version are you on?
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Staged Migration isn't support for 2010 is it? <br />
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Exchange 2010 SP3
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No comment has been added to this question in more than 21 days, so it is now classified as abandoned.<br />
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I have recommended this question be closed as follows:<br />
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Split: <br />
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seth2740<br />
Experts-Exchange Cleanup Volunteer
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I have 7 Accepted domains on an Exchange server, 3 of which need to be fully migrated away to Office 365. The main Domain which has the SSL Certificate installed for the DNS names for the OWA, ECP, OAB, outlook anywhere ETC will be staying. <br />
The three other domains will need to be put into the cloud and can't rely on anything from the exchange server once migrated. <br />
I have completed a few single domain cut over migrations and understand the process needed. <br />
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Due to the Exchange server having to still serve the other 4 domains I'm at a bit of a loss with what to do.<br />
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My suggestion;<br />
Create three new Office 365 portals with the the domain verified <br />
Create an endpoint to the Server (Cut over migration)<br />
Create the Batch, (which will populate all users)<br />
Manually remove any users that don't need to be synced accross<br />
Repeat for the Delta syncs (incremental) <br />
Once the mailboxes have populated and the delta sync has change the DNS Records to that of O365 on the domains, apply the licenses <br />
Remove the batch
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I have 7 Accepted domains on an Exchange server, 3 of which need to be fully migrated away to Office 365. The main Domain which has the SSL Certificate installed for the DNS names for the OWA, ECP, OAB, outlook anywhere ETC will be staying. 
The three other domains will need to be put into the cloud and can't rely on anything from the exchange server once migrated. 
I have completed a few single domain cut over migrations and understand the process needed. 

Due to the Exchange server having to still serve the other 4 domains I'm at a bit of a loss with what to do.

My suggestion;
Create three new Office 365 portals with the the domain verified 
Create an endpoint to the Server (Cut over migration)
Create the Batch, (which will populate all users)
Manually remove any users that don't need to be synced accross
Repeat for the Delta syncs (incremental) 
Once the mailboxes have populated and the delta sync has change the DNS Records to that of O365 on the domains, apply the licenses 
Remove the batch

Multi Domain Office 365 Migration

Microsoft Office is an integrated suite of applications that includes Outlook, Word, Excel, Access, PowerPoint, Visio and InfoPath, along with a number of tools to assist in making the individual components work together. Coding within and between the projects is done in Visual Basic for Applications, known as VBA.

Microsoft Office

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Office 365 is a group of software plus services subscriptions that provides productivity software and related services to its subscribers. Office 365 allows the use of Microsoft Office apps on Windows and OS X, provides storage space on Microsoft's cloud storage service OneDrive, and grants 60 Skype minutes per month. Office 365 includes e-mail and social networking services through hosted versions of Exchange Server, Skype for Business Server, SharePoint and Office Online, integration with Yammer, as well as access to the Office software. All of Office 365's components can be managed and configured through an online portal; users can be added manually, imported from a CSV file, or Office 365 can be set up for single sign-on with a local Active Directory using Active Directory Federation Services.

Microsoft 365

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.