# Defining the Back-End System (BES)

You can define or modify the processing system resources or BES to be used with the recipe or trigger definition.

Note: Do not consider any dependencies before performing the following steps.

## Procedure

1. Select option 4 - Define Processing System Resources to go to the Define Processing System Resources panel.
   For more information about this panel, see Define Processing System Resources Panel.
2. On the command line, enter `ADD`, and then press Enter to create a new Substation ES interface.
3. Select a Substation ES interface:
   - C(ics): CICS Interface.
   - I(ms): IMS Interface.
   - A(dmin): Administration Interface.
4. In the Identifier field, enter up to 16 characters to name the interface.
5. In the Interface Id field, enter up to 8 characters to identify the assigned interface. Press Enter.
   Note: The interface ID must match the ID that is defined in the Interface SIP member.
6. Exit the Define Processing System Resources panel in either of the following ways:
   - Press PFK3.
   - On the command line, enter `END`, and then press Enter.
7. Review the message displayed in the upper-right corner of the Transformer Configuration panel to verify that your changes have been saved.

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