What are you trying to trim (can you post screen capture of trim from the example file)?
You can use a simple line on a 2D sketch to trim or use the line to create a workplane.
More information is needed on what you are trying to do.
Are you trying to model the perfect parts with no intersection?
Will you be making these parts in-house or sending out to a vendor for manufacture?
What is the manufacturing tolerance?
How will the individual gores be assembled?
Sheet metal like this usually has liberal tolerances and the slight intersections in this technique might not be of enough significance to worry about. Check with the fabricator out on the shop floor to see if the solution will be good enough.
@Sam B : I've thicken them individually, but how to make separate solids? ( how's the next step ? )
Please see the attachment.
@JDMather : I just want to do what TheCADWhisperer did. ( not making perfect parts with no intersection )..
Use the New Solid button in the Thicken/Offset dialog box. You can go back and edit your Thicken features as shown:
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Inventor Professional 2013 SP1.1 Update 1
Windows XP Pro 32-bit, SP3
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SpaceExplorer/SpaceNavigator NB, driver 3.7.18
still waiting for a foreshortened radius dimensioning tool in Drawing Manager