This command deletes a data element from an entry in the boot configuration data store. bcdedit /store /deletevalue Specifies ...

This command deletes a data element from an entry in the boot configuration
data store.

bcdedit [/store ] /deletevalue [] 

      Specifies the store to be used. If this option is not
                specified, the system store is used. For more information,
                run "bcdedit /? store".

            Specifies the identifier of the entry that will be modified. If
                not specified, {current} is used.  For more information about
                identifiers, run "bcdedit /? ID".

      Specifies the option that will be removed from the specified
                entry. Run "bcdedit /? TYPES" for more information about
                data types.

Examples:

The following command deletes the bootsequence option from the boot manager
entry:

    bcdedit /deletevalue {bootmgr} bootsequence

The following command deletes the Windows Preinstallation Environment (WinPE)
value from the current operating system boot entry:

    bcdedit /deletevalue winpe

The following command deletes the Windows PE value from the specified operating
system boot entry:

    bcdedit /deletevalue {cbd971bf-b7b8-4885-951a-fa03044f5d71} winpe