After many hours of sifting through my database to filter un-needed accounts, I finally started my conversion!
I gave myself a crash course in Microsoft Access and was able to get my tab delimited file into Helios.
It wasn't fun, and it's not something that everyone would want to tackle. Many, many hours of trying various ways of doing things. Good thing I had backup copies of everything too! I needed them.
Well worth the effort to have my client database exactly how I want it.