How does one create multiple reference planes along a spline or a curved line?
I made a video which I hope helps.
Add points to your curve (in the same sketch or seperate) and make sure they are where you want your plane to cross the curve. use the coincident and/or pierce restrains for the point.
Under the features tab select 'reference geometry' and choose the 'plane' feature.
Select the point and (should default to coincident) and the curve (should default to perpendicular) and click the green check to accept.
Repeat the above steps as required.
I hope this is what you were looking for. Please feel free to leave questions and comments on how I can make this better - and if it helped you please be sure to check the "it worked" below.