# File Concatenating
**URL:** https://community.mp3tag.de/t/file-concatenating/70342
**Category:** Support
**Created:** [December 14, 2025, 8:03pm UTC](https://community.mp3tag.de/t/file-concatenating/70342 "2025-12-14T20:03:41Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@Zombeezy](https://community.mp3tag.de/u/Zombeezy)
#### Post date: [December 14, 2025, 8:03pm UTC](https://community.mp3tag.de/t/file-concatenating/70342/1 "2025-12-14T20:03:41Z")
Is there an easy way to select x number of files, named 01 Song A, 02 Song B, etc, and then add 1- to each one?
I just had to manually rename with Ctl-C & Ctl-V over 400 songs from 18 CDs. After selecting
all the ones from CD1 and adding the 1- to them those, I’d like to then select all those from CD2 and add 2- to the file names. Usually they are all in their own folders but I end up putting them into a single folder and need to distinguish 01 Song A in folder 1 from 01 Song A in folder, such as 1-01 Song A, and 2-01 Song A.
Thanks!
I can kick out to a file renamer program but prefer to do it all in MP3Tag
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### Author:  [@ohrenkino](https://community.mp3tag.de/u/ohrenkino)
#### Post date: [December 14, 2025, 8:11pm UTC](https://community.mp3tag.de/t/file-concatenating/70342/2 "2025-12-14T20:11:55Z")
have you filled the field DISCNUMBER?
If not, try the auto-numbering wizard and set to only write the discnumber.
Then try
Convert\>Tag-Filename
Format string: `%discnumber%-%_filename%`
If you want to set it manually for CD2, try
Convert\>Tag-Filename
Format string: `2-%_filename%`
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### Author:  [@system](https://community.mp3tag.de/u/system)
#### Post date: [January 13, 2026, 8:12pm UTC](https://community.mp3tag.de/t/file-concatenating/70342/3 "2026-01-13T20:12:40Z")
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