What do you really want to acomplish?

You could use an orthograpic camera if you really
want a flat looking image, (all points translated to y=0?)

Or you could #declare a tranform for later use.
#declare Foo = transform{translate <...> rotate <...>};
object {Scene transform{Foo}}

Or you could #declare your control points.
#declare CylA = <...>;
#declare CylB = <...>;
cylinder {CylA,CylB,R}// original
cylinder {<CylA.x,0,CylA.z>,<CylB.x,0,CylB.z>,R}// z ignored

Etc.

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