Following up with our last blog post from last week, I wanted to get into a little more detail on doing advanced customization. I tried to balance showing you the process and keeping the length reasonable. In any case, I think I cover the parts that you need to know to start making new invoice templates.
I do not cover html in any depth. If you don't known basic html, there are lots of places on the web to learn more about it. Hopefully, this will give you enough information to get started making your own invoice templates exactly how you want them.