You then need to open the application WinPEImageCreator (There is a shortcut on the desktop)

Select the image to edit. In this case select EraseSystem

This will open the project

Now go to the advanced tab on the menu, and select Drivers

This will then open a dialog where you can select the driver directory to include, click on Add driver directory and you will then be able to navigate to the Drivers directory

Once you have added the directory to the list you can click on Save and close.

Now you can click on Build Image and this will build the WDS boot image. It will ask you if you want to create a backup of the current image.

Once the image has been built you can upload that image onto the WDS server. The newly created image will be in the directory  WDSImages