PLOT.LY how to delete old plot or data points

I am working on some prototyping with PLOT.LY and have followed the existing examples from imp to upload data to plotly. Things have gone smoothly so far, but I need help with following topics.

  1. Is there any way I an delete older data points or graphs in plotly, either manually or through an imp code. I have some spurious data points that are out of range. I could not find an easy way to do so.

  2. I want to create a dashboard with 2 plots. One of them is a scatter graphs and the other one is a fuel gauge. Is it possible to do so.