For changing the subsidiary hierarchy user should set the ALLOW SUBSIDIARY HIERARCHY TO BE MODIFIED [MAX: 30 DAYS]
Got to set up> company> Genaral Preferences

After setup a max date for the subsidiary hierarchy to be modified. Edit the subsidiary now the parent-subsidiary field is editable change the parent and click save.
Please note the following while enabling/ setting up Allow subsidiary to be modified.
Modifying entries in the Subsidiary Hierarchy can have significant legal and financial consequences. Please be certain you are authorized to make such changes and consult with the appropriate stakeholders in your organization before proceeding. By proceeding to make such changes, you are acknowledging and agreeing to the following on behalf of your organization:
At a minimum, Oracle recommends that you read the official documentation and review and download all documents that may be relevant to these modifications, including but not limited to Financial Statements such as the Balance Sheet, Income Statement, Trial Balance, and audited reports from prior periods on both Consolidated and Subsidiary Levels, as well as Consolidated Exchange Rates.
To ensure modifications are implemented correctly, make the modifications first in a Sandbox Environment and then thoroughly review all Financial Statements and Consolidated Exchange Rates to ensure the modifications had the anticipated consequences before deploying the modifications in a Production Environment.
The consequences of implemented modification are outside the scope of any support made available to your organization by Oracle, and your organization is solely responsible for the effect of such modifications on your organization’s use of the product and for any costs or expenses arising from or related to such modification, including but not limited to the cost of any required data fixes.
Areas of the product that may be affected by such modifications include but are not limited to the following:
- Existing financial statements may be lost with no possibility of recovery
- Subsidiaries may get inactivated
- Consolidated/Budget Exchange Rates may be irreversibly recalculated
- Elimination Subsidiaries may get different parent Subsidiary
- Auto-Elimination Journals may post to the incorrect Elimination Subsidiary
- The Include Children (Subsidiaries) option may include a different set of Subsidiaries than before
- Granted restrictions on roles may change
- Reporting may not provide correct results if crossing Subsidiary Hierarchy Modification change date
- Customization and scripts utilizing Subsidiary may begin to fail
If you have questions before making such modifications, you may open a support ticket to request assistance from Oracle.
I have read, understood, and agree to the above on behalf of my organization.