I would like to know if there is a way to assign numbers to forms I print using word. Here's my scenario:

I use word to print research packets. Each packet needs to have three of the pages inside labeled with the same Subject ID number, and each packet gets a unique number. These numbers simply increase sequentially.

Currently, every time I print these packets, I have to manually go and label these three pages by hand. This occupies a considerable amount of my work day, and is tedious. I was wondering is some way to automate this process?