Hi scott, for a case like that you could use Loft rather than using either Sweep or Network.
Select your curve, run Edit > Separate to brake it into 2 separate pieces. Then select those to use for the profiles for Loft and run Construct > Loft.
That will construct a surface that goes through those curves without needing to build any other pieces.
If you wanted to use Sweep or Network instead of Loft you would indeed need to put in some kind of profile curve in addition to the rails, because both of those commands expect to have 2 sets of curves, one for each surface direction. Loft on the other hand only needs one set of curves in a particular direction.
- Michael
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