Keychain: Multiple Accounts On the Same Website

As you use Safari, when you log in to a new website, or a previously visited website with a new user ID and password, Safari will (usually) ask if you'd like to save that credentials combination in its password manager. Click the affirmative and that's it.

The next time you wish to login to that site, you will be prompted to select the appropriate UID & password.

Optionally, you can manually enter the UID & PW into the Safari password mgr by visiting Safari Preferences > Passwords and unlocking the pane then enter the info you'd like it to remember.

From my experience Safari and Keychain Password is a little less flexible from a Third Party Password Application. The solution from D.I. Johnson would work.

Example - Same Website and wife has User ID and Password, I have a separate User ID and Password. She uses a separate Windows based computer I use Only Apple.

When I try to use her ID and P/W on Apple computer - It wants to UpDate the Wife ID / P/W which I choose to not to do.

The Browser I'm using handles that well. Other Browsers should also.

Brave, it's Chrome Browser without google & without Ads...

https://brave.com/