A) PLANE "Parallel to a point", this mean you can select a reference face or plane, then a point, so it create a plane parallel to the original face or plane but at this point for the distance, and it stay linked to the point and face, as it should be.
B) Plane "Normal to a curve" at a point or ratio, the curve can be a line, a spline, an edge from a solid, and a point can be selected or a ratio can be use, like 0.3 (from 0 to 1), or distance...
the best of all, if you can make array of plane at a ratio, this is useful for using these planes to make intersections, splitting solids... imagine you make 20 normal planes on a spline in one function, then you make intersection of these planes with a shape or a solid.
These 3 type of plane exist in an other CAD that i was using and it missing now, the A) is the one I was using all the time, Normal at a point or ratio is great too.
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