Generate custom report?

[Zachary Drummond]

Good morning! I've been trying to figure out how to modify the 
"collection size" report in Tellico, but I can't find the templates for 
the reports that generate graphs. I would like to modify the collection 
size graph to also include a second line graph tracking the number of 
books in my collection that are marked with the read checkbox. Is this 
possible?

Thank you, and have a great weekend.