Close Companies (due to acquisitions/change of business status) and move employees into the acquiring organization as of a specific date.
To Merge two Organizations:
1.Click the Companies icon.
2.Click Tools > Duplicate Companies.
3.Click the Organizational Merge tab.
4.Click the Select Master Company icon, 
.
5.Search for the acquiring Company into which the other Company is to merge.
6.Click the Search Merge Company icon, .
7.Search for and select the Company to merge into the acquiring Company.
8.Use the calendar icon to select a Merged From date. Default is today's date.
9.Click Merge.