Adding/removing data from an existing excel document.

Hi Guys!

Ok, im new to the whole AutoIt scene but what i can tell you is, im loving it! I've been up for hours on end just tinkering and getting myself
familiar with this amazing software.

So far i have made a little app that does my weekly & monthly reports for me! hahaha if not why not! is what i say!

I have done this by just reading up on the doumentation and using that amazing little window tool, so far i have done EVERYTHING i needed
just from that, thats how crazy awesome your documentation is!

Now, i just need the app to use an already existing excel doument, with code inside it that adds rows and colums up in totals and such.
When i try and use the option, it pretty much removes all my code, data and just throws the new info in.

I need it to just add the new data into the blocks, removing the old data inside that block and saving the document. The excel document
already has my calculations and macro code inside it to do the rest (which makes a nice graph on another tab inside the document)

Is there something i am doing wrong here? Is there another option i should be using? Any help would be greatly apreciated :3