How do I delete multiple contacts at once

Hi Ogle1968,

Welcome to the Apple Community.

If you see duplicate contacts after setting up iCloud Contacts

Here's how to remove them

https://support.apple.com/en-au/HT203565

or

Hide duplicate contacts on iPhone

You can link duplicate cards to "hide" all but one

https://support.apple.com/en-au/guide/iphone/iph2ab28320d/ios

if you delete contacts from your email account,

you also permanently delete the contacts from all devices signed into that email account.

Or

Want to add or remove all of the contacts from an account that you already set up?

Just turn Contacts on or off for that account:

1. Go to Settings > Contacts > Accounts.

https://support.apple.com/en-us/HT207207

Hope this helps :)