how to choose specific window in plot?

if i draw a plot and then i decided to choose only a specific window from this plot, how can i use only this specific window for further calculations?

[KALYAN ACHARJYA]

Which windows, can you elaborate please?

[moaad abd allatif]

i want to choose a part from the plot -

foe example if X axis is from 0-100 - i want to take the plot only from 5-10