Data can be entered into the project in "Project Options". Right click on the project file and choose Project Options. Go to Parameters and enter the information there.
Now this information can be accessed on all the schematic pages (and in the PCB) using Special Strings.
You can also add parameters to each document using the Document Options features.
edit: I just saw the title that said PDM.. I guess you need to transfer them in some way into the project, I can't help you with that, sorry!
Currently there is no way to do this but SW is working on PDM integration ...