The OMD Orphans page is available from the OMD Orphans button located on the OMD Sync Settings page.

From the OMD Sync Settings page, selecting the Create accounts using OMD Orphans option located under the OMD Server Connection Settings drop-down, to import all OMD accounts which don't automatically map to existing Central accounts based on like account name and/or serial numbers and equipment id's.  This will create an equivalent Central account.  Alternatively, it may be preferred to deselect this option and use the OMD Orphans page to systematically select which accounts to import/create in Central mirroring your roll out strategy.

Select which accounts to import/create by leaving the default <create new account> value, or if the the Central account already exists but the name differs, select this field to display a list of Central accounts, and select the appropriate match.  Select the Mapped option to apply your changes.  After you've applied mapping to the necessary accounts, select the Save button to finalize the OMD Orphans mapping.