One of the new features in Plant 3D 2014 is to use a custom view to create an orthographic. Previously, we were locked into the predefined views – top, left, right, bottom, front, back.
Per the screenshot below I have created a model that has some pipe at an angle. Notice that my ucs is set to World (as proof that the line really is skewed).
After clicking the create orthographic view button, here is the view of my model.
To start setting up my custom view, I need to create a new ucs that is aligned with my pipe. Click the WCS icon and select new UCS.
Use osnaps to get the UCS aligned to the piping.
Then click the navcube to rotate to the isometric view that you want, make sure the Unnamed UCS (which you just made) is selected.
Below are the results
Make sure the current view option is selected in the ribbon:
Click OK to generate the ortho: