What is Macro? Macro is a handy tool for frequent Excel users that helps to save time and automatically configure some commands. Macro works with VBA (Visual Basic for Application) program codes, but ...

If they're Excel add-ins, I think you're going to be out of luck. Sounds like you're on the right track though. You're almost certainly going to use CreateObject.

How to Read the Data From an Excel Sheet Using VB Macros Coding. Excel sheets read data in cells using cell references, which are the addresses that identify each cell.