A name is assigned by default when creating a new curve. This is made up of channel type and possibly axis or the operand name. However, you can also assign an alternate name to the curves. Ensure that this name is unique across all curves.
The CurveĀ > Name and Unit... command opens a dialog box for changing the name and unit of the active curve.
This is useful, for example, if you want to retroactively give a PLC operand an unambiguous name, or if a curve is to be supplied with some brief additional information, or if a calculated curve requires a different unit.
For curves copied from one graph into another, the name of the original file is also shown. You can change this entry here.
Cut/copy/paste/delete curves