Hello northridgemktg,
It's great to have you connect with us here. I can see the importance of being able to assign a reps names to a customer's profile in QuickBooks. Rest assured, I'll be glad to share more info and make sure you're on the right track.
The feature you've described isn't available yet in QuickBooks. I encourage you to send this as feedback to our engineers. To send feedback, click on the Gear icon > click on Feedback > enter your feedback > hit Next to submit your feedback. New product improvements are largely based on the valuable feedback we get from users like you.
In the meantime, let me know if you have other questions. I'll be one message away.