How to link a contact in a record if it already exists?

[mansi.kakkar]

A contact has a unique identification number. There is an entity B, where a field contact should automatically populate if UID exists in the contact. Is there a formula that can help achieve it?

[victor]

Please describe in more detail: what exactly are you trying to implement?

[emillod]

mansi.kakkar
You can accomplish this by using Hooks or Formula. If you have field, you can try to use this one: https://docs.espocrm.com/administrat.../#recordexists