how to draw 3d curves in catia v5

how draw guide curves for the exhaust pipes in exhaust manifold design.
I need information about the model i attached and how to draw it.I designed all other parts of that engine but stuck with this manifold..if possible do help

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In Catia we can't able to draw 3d curve directly first you have to make two sketches of two different views of curve you want to make
including either front, top back view then
You have to use combine option to get 3d curve...
Combine option you will find in surface design or you can use that by command c:/combine
Try this...

 
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