Ability to make calculations directly with AgilLink on debit/credit GL lines using Excel style formulas

I think it would be helpful to be able to do calculations directly within AgilLink when paying an invoice/booking a deposit. For example: if I'm coding out an invoice with 25 invoices and 5 of them are all say airfare expenses, I would like to be able to calculate that by doing =a+b+c+d+e where normally I would calculate this separately and type the total. Sometimes it can be difficult to keep track of what line items you've already added up, and creating a new line for each line item on an invoice can be time consuming.

It would also be great is somewhere on the backend you could see what calculations were made. Additionally sometimes when viewing an invoice already paid by someone else it could be helpful to have this because it would provide a quick explanation of how they made their calculations. Even just basic formulas of addition, subtraction, multiplication, and division I think would be helpful.