Procurement of non stock items without using material master?

Hi Experts

My company follows third party scenerio with non stock items . The procurement process starts from creating a PR thru network by entering a material master and other purchasing information in component overview. I have come to know from some sources that in case of non stock items we may process the same by not using the material master and just entering a material description and other purchase related information. So, my questions is:

Is it possible to follow the procurement process for non stock items without using material master? And if it is Yes, then how will i maintain the tax coditions which i generally do for material and vendor combinations.

Thanks