in the attcehd file there are 3 graphs in one box, but on the y-axis all the three graphs have the same range i.e is 0-500. But if i want to customize the three graphs with differetn ranges (like 0-200, 0-300, 0-500). So that all the graphs would fit in neatly. I tried changiin them but, all the values are changing at the same. or should i plot the three plots separatly. Plz share an answer, as i should submit this paper.
The picture that you inclosed is an incomplete graph. You have cut off all of the axis values, which are what will give the clues as to how you have actually setup the graph.
But, I will assume the issue is, that you have defined the 3 graphs by using a Y Grouping of a variable that has 3 different values. Graphs setup with groupings maintain the axis values for all 3 graphs. To setup a chart with separate setable axis values, you will need to set graphs us as separate variables on the graph. For documentation on these options read the section on the Graph Builder in the Essential Graphics book