Manually adding or copying IPO curves

A question popped up today, and I don’t know how to answer it.
I can create and plot delta IPO curves ok with python, but how would I or someone else do this manually

or copy and pasting IPO curves to delta IPO curves
and vice versa?

I just learned this.

Select the parameter you want to add a cruve to in the IPO window.
Then CTRL-LEFT-CLICK in the graph area and you can create new curves for the parameter you have selected. There are also those up/down pointing arrows along the top of the IPO window. Mouse over them (bubble help will appear) and you will see they are the copy and paste buttons. I don’t understand why the icons set does not use standard cut and paste icons, but that is what they are for.

Thanks very much, I couldn’t find any information on this at all