Customer import or mass change

[Ruben-Bike-Butler]

I got an error with customer import.

 

I can create a CSV from Workbase (our back office program) but I cannot get the sampe customer import CSV from Prestashop, it just gives an error.

 

My main problem is that with the update to Prestashop 1.6 almost all of our customers have some error in either

Bank account, Tax number but mostly in assigned groups leading to not being able to order.

 

Is there a fast way to mass change customer groups so that i can select say a range of customers and assign them to a group.

A CSV file on how to import customers would also be nice.