Is there a way to insert a 2nd "sound" line in the timeline for background music and fx? In the past I attached a 2nd sound to a tree or generic item but if I want to go back to delete or change the sound I don't always remember which item I attached it to and get very frustrated. Should I just wait and add the 2nd background sound when I import it to my video program?
Thank you.

When I want multiple audio files in a project, I add a simple cube and make it a DUMMY prop.  As many as needed.
Then I can name it so I know which is which, such as "Audio - Gunshots"  or "Audio - Door squeak."

Eventually, it is best to do your final audio work in a video editor where you have much more control over volume levels, etc.
But I do like to add some audio bits in iClone sometimes.  They can help me with timing and the creative animation process.

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iClone 7... Character Creator... Substance Designer/Painter... Blender... Audacity...
Desktop (homebuilt) - Windows 10, Ryzen 9 3900x CPU, GTX 1080 GPU (8GB), 32GB RAM, Asus X570 Pro motherboard, 2TB SSD, terabytes of disk space, dual  monitors.
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Great idea, thank  you.