Rotating a complex shape

[shdesign]

I have a sheet of corrugated metal that I need to rotate to flatten out within my file. I have tried all manner of ways to get this to work but can’t figure it out.

I want the closest end to be flat instead of angled, like everything else in the file.

Can anyone help with this please? What do I need to do?

Wood Store Pieces.skp (1.6 MB)

[Box]

Select the geometry, then get the rotate tool, use shift or left arrow to lock it to the green axis, click on one end, click on the other end then rotate until you see the red axis, or it says on red axis.Click to finish the rotate.

[shdesign]

Thank you for your fact reply. It seems so simple now!