InfoPath Dev

Hello All, At my workplace, we're offloading some end of life equipment (about 200). I would like to keep track of what I've already dismantled and formatted. What I want to do is, create a form with one column having the number 200 and another field with a drop down menu on whether it's a desktop, laptop or server. Every time I select an option from the drop down and submit the form (email submission), I would like to subtract 1 from the number. So to start with 200, then after I enter the information and submit the form, the next time I open the form, the number left should be 199. Then fill out another form and the next time, the number should be 198 ... and so on. I'm a little familiar with Infopath and would like to know how to do this. Looking forward to the answer and thanks in advance.

Ok I was able to create a Sharepoint Data Connection library and insert an xml file. I'm also able to read the data of that file into the infopath form. How do I subtract from the number, update the xml data and then read from it again?

Still wworking on this; I was able to get the subtraction, but ... its not saving. When I open a new form, it starts again with the original number. I need to be able to update the data connection with the new number....