Is it possible to edit a contact and edit this single contact in every group?

Updated 8 months ago

If I have a groups column like this:
Person: A, Groups: X
Person: B, Groups: X,Y
Person: C, Groups: Y
And I import this as "MyList.csv"
This will result in two lists:
- MyList.csv X
Person A
Person B
- MyList.csv Y
Person B
Person C

No. Every Contact is unique. The same goes if I would rename the first Person B to Person D, the second would still be called Person B, because there is no relationship between the two.