# Copying data from extended tag (catalognumber) to custom tag (CATALOG)

**URL:** https://community.mp3tag.de/t/copying-data-from-extended-tag-catalognumber-to-custom-tag-catalog/61619
**Category:** Support
**Created:** [July 20, 2023, 5:46pm UTC](https://community.mp3tag.de/t/copying-data-from-extended-tag-catalognumber-to-custom-tag-catalog/61619 "2023-07-20T17:46:38Z")
**Posts on this page:** 1
**Showing post:** 2

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### Author: ![ohrenkino](https://community.mp3tag.de/user_avatar/community.mp3tag.de/ohrenkino/32/4843_2.png) [@ohrenkino](https://community.mp3tag.de/u/ohrenkino)
#### Post date: [July 20, 2023, 5:49pm UTC](https://community.mp3tag.de/t/copying-data-from-extended-tag-catalognumber-to-custom-tag-catalog/61619/2 "2023-07-20T17:49:53Z")

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See the FAQs how to copy one field to another:

> [@Actions and batch-operations](https://community.mp3tag.de/t/actions-and-batch-operations/967/15):
>
> How to copy one field value to another field? Example how to copy the content of the ARTIST field to the ALBUMARTIST field: Create a [new action](https://community.mp3tag.de/t/actions/967/2) in an existing action group or make a new action group. Action type: Format value Field: ALBUMARTIST Format string: %artist% Note: If you want to copy all possible values of a field (in case you have multiple artist fields), the internal scripting function [$meta\_sep](https://docs.mp3tag.de/scripting) can be used in the format string, e.g., $meta\_sep(artist,\\\\)

The mapping is only a good way if you want to write a special field to a special kind of tags, e.g. like FLAC tags.

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_[View the full topic](https://community.mp3tag.de/t/copying-data-from-extended-tag-catalognumber-to-custom-tag-catalog/61619)._