Changing names of labels of plots of graphs or waveform charts

I am using a formular vi to do multiple calculations whose answers i display graphically on a waveform chart.
the problem is that labview does not allow me to change the name of label of the result from the calculation to what i want it to be displayed as to the front panel user.
well... it does allow me to change it to what i prefer but as soon as i run the vi the label name reverts to "result"
is there a way of getting around this problem?

Ok... sorry for the confusion
see what i meant below
if for example i am doing an efficiency calculation i would need an input and an output then i would calculate the ratio of the output to the input.
on my graph i would want to see a plot labels named input, output and efficiency
in the example attached i have simulated two signals and i did the calculation with the formular vi
on the front panel i can only see plots labeled DC, DC and DC(Formular Result)
i want to display these on my graph as Input, Outpt and Efficiency respectively
hope that clears the confusion
that is my problem, please give me the answer
Attachments:
code example.jpg ‏32 KB
front panel example.jpg ‏23 KB

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