You want to combine two KG-Chart charts into one?
You could run multiple KG-Chart programs.
So, just launch KG-Chart, in this case, three times.
Open each chart in two KG-Chart, and create a new chart in one instance.
The new chart size should be the one you are combining.
Now you can copy & paste from each instance to the new chart.
This works as long as both charts are using same chart type and color