Curves can be created using simple math operators in the Simple Math panel. You can combine two curves, transform a curve, or export the curve. For every operation, you can specify that the x or y values of the curve remain fixed.
You can also apply external filters to curves in this panel. Examples of external filters are in the filters subdirectory that is provided when this option is selected. Essentially, filters exchange data with HyperMesh, using the standard HyperMesh curve data file format.