hi, @cindy
you can do this in the separate drop-down with data:
https://support.wix.com/en/article/adding-and-setting-up-a-dropdown-list
but please note, that submissions will be landed in the Content Manager tab, not to the contact information, or members information
if you would like to have more advanced solution for members area, you can check Velo solution, which may fulfill your request:
https://support.wix.com/en/article/velo-tutorial-building-your-own-members-area