You are not able to find option to assign one Employee to multiple Org Units for same duration
This is a new feature introduced in organization management.
Now you can assign one employee up to two org units using the Primary and Secondary assignment attribute from UI for same duration.
One assignment will be primary with the Primary flag checked and other secondary primary flag unchecked.
1.Go to Organization Management workcenter
2.Select Org Structure view
3.Select required Org Unit
4.Select the tab Employees
5.In the Employees section, select the check box Primary
now assign this Employee to second org unit following above steps from 1 to 4 and keep the Primary flag un checked.
KBA , LOD-CRM-EMP , Employee , How To