This command-line option can be used with most Bcdedit commands to specify the store to be used. If this option is not specified, ...

This command-line option can be used with most Bcdedit commands to specify the
store to be used. If this option is not specified, then the system store is
used. Running "bcdedit /store" by itself is equivalent to running
"bcdedit /enum ACTIVE".

This option may not be used with the /createstore, /import and /export
commands.

bcdedit /store 

      Specifies the file name of the boot configuration data store.
                If the file name contains spaces, it must be enclosed in
                quotation marks ("").

Example:

The following commands list the active entries in the specified data store
file:

    bcdedit /store C:\DATA\BCD /enum ACTIVE
    bcdedit /store "C:\DATA\My BCD" /enum ACTIVE