You can create several types of curves by using these methods:
Point - from parameter, sketch or generated by projecting point to curve or surface.
Line - from two points parameters, sketch, two selected points, or generated by one point and one direction.
Circle - from parameters, sketch, from a point, an axis and specified radius, from coordinate and radius, or generated by 3 points.
Arc - from parameters, sketch, from a point, a axis, specified radius,start and end angle, from coordinate, radius, start and end angles, or generated by 3 points.
Ellipse - from parameters, sketch, from a point, a axis, specified major and minor radius, or from coordinate, major and minor radius.
Elliptical Arc - from parameters, sketch, from a point, a axis, specified major, minor radius,start and end angle, from coordinate, major and minor radius, start and end angles
BSpline Curve - interpolation points to construct plannar or spacial bspline curve or by interpolation points on surface to construct curve on surface.
Helix and Spiral - by specifying a circular sketch, number of revolutions, and height
Composite Curve - from a combination of connected curves or boundaries of shell
Middle Curve - generate middle curve or point from two selected curves or points
Fillet Curve - create fillet curve between two neighbour curves
Parabola - from parameters, from a point, an axis, or from coordinate, focal.
Hyperbola - from parameters, or from coordinate, major and minor radius.
Function - create piecewire curve by parameter definition, such as polynomial curve.
Polygon - create regular polygon by side number and side length or center length.
Sketch Curve - using sketch method to create or modify line, arc or b-spline curve onto a sketch plane.
You can also create or modify curves by using these methods:
Break Curve - break curve into several sub curves using angle or specified points
Merge Curve - merger neighbour curves into one single b-spline curve.
Bridge Two Curves - make a new curve which bridge two neighbour curves naturally
Smooth Curve - make noisy curve into a smooth curve
Morph Curve - morph curve by segment, control points or points on curve
Convert Curve - convert curve to/from XYZ, IGES, STEP, DXF, VDA file. Convert curve to keyword.
You can then use the curves to create surface or solid model features. For example, you can use a curve as the profile or path curve for a sweep feature, as the trim tool for triming the surface feature, as a parting line for a draft feature, and so on.
You can turn the display of curves on or off. To toggle the display of curves, Click View, Geom Curves.
To hide or show individual curves: Right-click the curve in the graphics area or in the Feature Tree, select Hide or Show. Or you can go to Geometry Toos->Management, select the curve ID, then click "(un)Blank". You can also finish it on Component And Sel.Part Dialog.