How do I enable multiple Business Units Fusion Service?
To enable multiple business units (BUs) for Service , you must set the following profile options:
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            Multiple Business Units Enabled (HZ_ENABLE_MULTIPLE_BU_CRM): Set this profile option to Yes. The default value is No. 
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            Customer Relationship Management Business Unit Default (HZ_DEFAULT_BU_CRM): Set this to the default business unit for your service application. 
You must ensure that the value of the HZ_DEFAULT_BU_CRM profile option doesn't remain blank, and the value is set to a BU. Otherwise, agents might see an error while creating SRs.
To set the profile options for Service BUs:
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            In the Setup and Maintenance work area, go to the following: - 
                  Offering: Service 
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                  Functional Area: Company Profile 
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                  Task: Manage Common CRM Business Unit Profile Options 
 The Manage Common CRM Business Unit Profile Options page shows the two profile options. 
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            Click the HZ_ENABLE_MULTIPLE_BU_CRM profile option. 
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            In the HZ_ENABLE_MULTIPLE_BU_CRM: Profile Values region, set the Profile Value for the Site Profile Level to Yes. 
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            Click Save and Close. 
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            Click the HZ_DEFAULT_BU_CRM profile option. 
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            In the HZ_DEFAULT_BU_CRM: Profile Values region, specify the Profile Value for the Site Profile Level. 
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            Click Save and Close.