Data variables can be created in the offline configuration, which are used to set device-specific values within the device cluster. Later when the offline configuration is applied to devices in the device cluster, the user is prompted to enter specific values for each parameter that is identified with a data variable.

1. On the Configuration Manager slider, select Configuration tools, Offline configurations.
2. Load the offline configuration. See the Load an Offline Configuration section for more information.
3. Navigate to a configuration element in the navigation tree that is unique to an individual device. For example, IP address, Hostname, and so on.
4. When element attributes are rendered, click the data variable (DV) tool icon in the upper right of the configuration body panel, and select an attribute to apply a data variable. A dialog appears if the targeted attribute supports DVs. The following table describes the required entries:

   Selecting existing DV drop-down list	This list is populated if previous data variables where created. This feature allows the use of DVs that share the same values across different elements such as an IP address. You can select an existing DV for re-use so that all fields are populated with the same input value. If you are creating a new DV, keep the blank selection and enter a new entry by filling out other fields in this table. Select an existing DV to pre-populate the following parameters.
   Name field	The an unique ID for the data variable. For example: WANCOM2_UTIL_ADDR
   Label field	The name for the DV that appears in the individual Device configuration wizard later.
   Description field	The description for the DV that appears in the tool-tip during configuration.
   Default value field	The default value for the DV. Note: This value can be overwritten when you apply a template to a device.
   Derive value check box	This box is not selected by default. Select the box to make the Formula field appear, so that the value for this DV is derived from the source information in the formula. Note: Deselecting this box makes the Formula field disappear.
   Formula field	The formula contains the name of the DV (in brackets) that is being referenced by this DV. For example: HS_ROUTE = 'sip:${SIP_INT_IP}:${SIP_PORT}' The user is prompted for SIP_INT_IP (For example: 192.168.1.40) and SIP_PORT (For example: 5060), and the value of HS_ROUTE is derived automatically (For example: "sip:192.168.1.40:5060").

5. Click Add.
6. Click Apply to submit configuration changes.
7. In the Success dialog, click OK.
8. Repeat the previous steps to add more data variables to configuration elements in the offline configuration that are unique for each devices.