While creating a chart, put the field that you want to show few points in any of the filters available - visual/ page/ report level filters.
1.For suppose you can show data points on the graph using a basic selection.
2. Advanced filtering by Top N or simple > or < comparison.
2. Other way of selecting from whole set of data points is through quick measures.
3. Add a slicer to select points using various combination.
Hope this will help you.