Using BEMCLI for delete existing older backup sets

Hello,

i don't find a cmdlet for delete older existing backup sets from an Media Server.

From the UI, Backup and Restore, select a Server and Backup Sets. I select the needed Backup Sets and with right Mouse clic Delete. Easy

This is possible only for one or more Backup Sets but not for any Servers and any many old Month backup Set.

From bemcli, i want use :

Get-BEJob "$ServerName $BackupType" | Get-BEJobHistory | Where-Object {($_.StartTime -lt $a)} | ????????

I found : Remove-BEJobHistory but will only delete the history. What happens with the Backup Sets ?

Otherwise, is it possible to change, with bemcli, the Expiration Date ? So BackupExec will remove automatically this older BackupSet

Thanks for help.

Daniel