I'm adding another bike profile to my Garmin 500. I've named the bike, added the weight, and zeroed the odometer. However, I cannot add the wheel size. There isn't a menu field available. I've got wheel size setup on the other bike, but can't access that data field on "bike2".
Any guidance would be appreciated.

Don't auto-calculate the wheel size. Put the wheel size for the second bike in manually.

That's just what I'm attempting to do, but I'm not getting the "MORE" option after the odometer setting.

And thanks!

Your best bets:

1 800-800-1020
https://forums.garmin.com/

The phone number is for their customer support, I don't know their hours. If you call them when they're open, you'll get a human within five minutes and that person might know the answer. I've had to call them twice, one time was lackluster and the other time the guy was on the ball and had good answers for me. If not, they have a forum for the 500, full of people who are pretty familiar with it.

Thanks, I'll give them a call.

It helps to have the speed sensor installed and paired.

IIRC the wheel size option will not appear without having a cadence/wheel sensor on the bike you are adding.

Definitely agree with Seattle Forest, have had very positive experiences dealing with Garmin customer service for support.