@Sahirrao02 welcome to the KNIME forum.
The graphic(s) you want do(es) sound quite complex. The way I see would be to use R (ggplot2) or a Python package with data preparation and file name handled by KNIME. Best approach would be to find an example code on the internet that comes closer and try adapt it (the community might be able to help with that).
Also necessary would be sample data (without spelling any secrets) that would contain all the challenges that you have described.
Also very useful would be a sample graphic in Excel (or hand drawn) so one would get a visual idea what to expect.