Here is the process to define the position of a cross-section. You must know the XY coordinates of the left and right extremities of your profile. Here it is :
X: 1614698.00 Y: 5693900.00 and X: 1651050.00 5 Y: 5661899.00
In petrobuilder2D, click on Grid-> Modify cross-section in the left pane
A new window will open:
At the bottom of the left pane just enter XY coordinates of the two points, and then click on the blue arrow at the bottom right “Start”
That’s it.
Ps: don’t forget to check the units (in meters)