Hi, Samuel,

Address line 4 is a special line reserved for City, Prov/State in formatted addresses.

However, try these steps:

1) Company Profile - Format Address? = off
2) Import Customers 'overwrite' with Address line 4 having 'something' in it (i.e. non-blank, even use TEST)

When you View the customer, it may appear that nothing has happened but it has. Then:

3) Company Profile - Format Address? = on
4) Import Customers 'overwrite' with Address line 4 having 'something' in it again (eg. the non-blank TEST)
5) View Customer and you'll see the formatted option for the customer is now 'off' and TEST is in Address line 4
6) Company Profile - Format Address? = off
7) Import Customers again, 'overwrite' this time having nothing in Address line 4 (i.e. it's 'blank')
7) View Customer and you'll see the formatted option for the customer is still 'off' and Address line 4 is now 'blank'.

You'll want to do this carefully and to check results at each step.