I highly recommend Michael Newton's books, "Journey of Souls" and "Destiny of Souls". Michael Newton developed a hypnotic regression to the time between lives, and discovered a very surprising consistency across subjects in their descriptions of that world, which Ra calls "time-space". A large portion of the books consists of transcripts describing how entities plan their incarnations. He describes "soul clusters" of entities who tend to work together, assuming varying roles, life after life. The material meshes nicely with the Ra material, and will shed some light on your question.
In short, before incarnating, entities plan to partner with a significant other, and program into their subconscious cues that will allow them to recognize each other (subsconsciously) when the time comes. This fits 100% with my experience - I know exactly what those cues were that allowed me to meet my soulmate, with whom I've been together for a very, very long time.
In short, before incarnating, entities plan to partner with a significant other, and program into their subconscious cues that will allow them to recognize each other (subsconsciously) when the time comes. This fits 100% with my experience - I know exactly what those cues were that allowed me to meet my soulmate, with whom I've been together for a very, very long time.