Surface Parking manual mode
With update 4.6 to TestFit, you can now edit surface parking in manual mode.
Editing the drive aisle
You can add and remove sections of drive aisle by selecting the drive aisle spine and then left click and dragging in the direction you want the new drive aisle to go.
Editing the parking stalls
You can edit the run of stalls to be single loaded on either side of the drive aisle, as well as removing them completely by right clicking the drive aisle spine.