If you want to output a specific numeric value as a formatted string, you can use the [Number Formatting] logic to output in the specified format.
You can store the input data "123" as “0000000123" to a character string type of script variable by specifying "0000000000" in [Format] of the [Number Formatting] logic.
Please refer to the following help for details about the Numeric Formatting logic.
- [Mapper Logic Guide]-[String]-[Number Formatting]