Setup common file directories for each of them to use. Then set values to their path in the web.config file. When deploying your code to another server (QA, test, production, etc.) setup a separate web.config that uses file transformation to specific the new location for each directory. Microsoft has some good tutorials on their site on how to use web.config this way. Start here
. Side Note: It's a little involved to set this up but a real time saver in the long run when it comes to deploying projects.