The Cinegy Archive master clip itself does not allow the replacement or addition of media tracks. Although it is possible to generate a new copy of the media with the required tracks layout.

The recommended way of new master clip versions generation is using Conform Capturer function. The Conform Capturer ingests existing Sequences into Cinegy Archive and creates a new Roll. 

If you need to avoid the transcoding, you can apply the following workaround:
1. Export the first master clip from Roll to MXF Op1A with the direct transcoding profile.
2. Export the second master clip from Roll to MXF Op1A with the direct transcoding profile. In the result, you will have two video files with different audio tracks.
4. Create CineLink - https://open.cinegy.com/products/convert/24.2/cinelink-file-support/cinelink-file-configuration/#specifying-separate-files-as-a-source and specify which tracks and from which file to take.
5. Import the specified cinelink using the direct transcoding profile.