I am working an "Import file" process. This process involves a mapping step and I'm trying to make it as easy as possible. I would like to avoid the horizontal scroll... Do you have any example from other application that could help me?
SalesForce has a mapping data functionality SalesForce screenshot
The vertical method is preferable since the user can scan each mapped data side by side and avoid the eye jumping from the table header to the buttom.
Pre-mapped cell ---> Mapped data