Since you are inside SOLIDWORKS, you can use the Manager Tree to select the edges of your model. Mastercam 2017 is great at "seeing" the profile of your solid.
If you’re a SOLIDWORKS user, you already know the power of your design environment. But when it’s time to move to the lathe, you don't want to export files and lose your associativity. That’s where the Mastercam for SOLIDWORKS (MCfSW) add-in comes in. Mastercam 2017 for SOLIDWORKS Tutorial (Lathe)
Use the and Verify functions. Verify gives you a 3D representation of the stock being cut—watch for any red collisions! Since you are inside SOLIDWORKS, you can use