I'm aware this can't be done with Rufus, and I've tried YUMI to no avail.
I use several diagnostic tools on a regular basis (Hiren's Windows Boot CD, Lenovo utilities and a lightweight Linux OS) and would like to consolidate them to one USB drive I carry on my keychain.
My understanding is that all I need to do is make several partitions, format them properly and image each with whatever image I'd like. When I reach the boot menu, I'll see all X partitions listed and will be able to pick and choose which image I'd like to run.
However, this hasn't worked for me in practice. Has anybody been able to do this? Any advice is very much appreciated!