Did you ever get any info on your Walter B. (Beauregard) Harley?I am in his brother William Daniel Harley's line.My info has Walter B. having the following children: Lillian "Lillie Mae", Mary Elizabeth, John Lawton, and Thomas Raysor Harley. Wives are as you stated.
Orangeburg County, SC Deed Book 20, page 25 - Walter T. Harley to Walter Beauregard Harley: 100 acres land, Orangeburg County, Elizabeth Township, North side of North Edisto River, Glaziers Branch, known as "Mill Tract".
I hope to find out more about your family line if possible and I can share more of my line. I live in the SC area.