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# copyFieldNoOverwrite

The `copyFieldNoOverwrite` method copies a field value to a new field but does not overwrite the existing value. After calling this function the target field will contain all values of the source field in addition to any values it already had.

## Syntax

    copyFieldNoOverwrite( sourcename, targetname [, case])

## Arguments

Argument | Description
--- | ---
`sourcename` | (string) The name of the field to copy.
`targetname` | (string) The destination field name.
`case` | (boolean) A boolean that specifies whether `sourcename` is case-sensitive. The name is case sensitive by default (`true`).

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