Editing timelines together

Hello,
Seems like a dummy question, but I have use one timeline for each sequence of my film. I have created another timeline to put together the film, importing timelines into the main one. My question :
Each timeline contains 8 audio tracks, when importing them onto the main timeline, only 2 tracks is imported.
I could not find the equivalent of the "clip attribute" contextual menu like I have for clips and where I can chose the number of audio track to be imported.
This is possible right ?
Thanks
Alexandre
Seems like a dummy question, but I have use one timeline for each sequence of my film. I have created another timeline to put together the film, importing timelines into the main one. My question :
Each timeline contains 8 audio tracks, when importing them onto the main timeline, only 2 tracks is imported.
I could not find the equivalent of the "clip attribute" contextual menu like I have for clips and where I can chose the number of audio track to be imported.
This is possible right ?
Thanks
Alexandre