How do I create subheading in an invoice

How do I create subheading in an invoice

We are test running ZOHO products so that we can use it for our operations.

But we need to know the possibility of of customizing the invoice template to have a semblance of our excel template. Attached is a sample of how our existing invoice looks like. The emphasis is on the sub-topics A, B and C and there may be more or less depending on the job.

Let us know if this is achievable with your invoice template customization.