Hi Andrei, try the attached plug-in command, copy it to the \commands sub-folder and then that will make a new command named MultiIso available which can be triggered by a shortcut key or by pushing Tab and typing in MultiIso and pushing Enter.

It takes an edge curve as input, the edge curve should belong to only one surface (use Edit > Separate if needed), and then the source points for the isocurves are taken as evenly spaced points along that input edge curve.

The regular isocurve command does not generate results that exactly overlap over top of edge curves, so this will not duplicate the outermost ones, if you want those added you can generate those quickly by selecting and using Copy+Paste though. This should generate all the internal ones though.

- Michael