Pick your trajectory curve, and unless otherwise specified, your section will remain normal to that curve. Now, add your additional trajectories one at a time, starting with the next most important, with dimensions to constrain the sketch. As you add trajectories, you will need to delete simensions in the sketch. This will help you troubleshoot. Your additional trajectories should be as long as your origin trajectory curve, in a plane normal to the endpoint.
As noted, without a pic of what you're trying to do, it's almost impossible to help.
Best of luck.