Hello Alberto,
Welcome to UCS.
I will share one way to reset multiple servers at same time but there might be other options in CLI / GUI that I am not aware of.
1) Create a IPMI policy with a user having admin rights.
2) Associate the IPMI policy to the service profiles
3) Create a script or batch file with ipmi commands target CIMC ip address.
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power down the host
ipmitool -H -U -P raw 0 2 0
power up the host
ipmitool -H -U -P raw 0 2 1
power cycle the host
ipmitool -H -U -P raw 0 2 2
hard reset the host
ipmitool -H -U -P raw 0 2 3
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HTH
Padma