Hello,
Unfortunatly you cannot automate to delete the previous differentials.
However what you can do is set the Overwirte Protection and the append Period such that the new backup overwrites the new one inturn deleting the new entry.
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Please go through the following documents as ref:
The basics of Advanced Device and Media Management for Backup Exec for Windows Servers
http://seer.support.veritas.com/docs/192265.htm
An explanation of the "Overwrite Protection Period" and the "Append Period"
http://seer.support.veritas.com/docs/237374.htm
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Thanks.