The short answer to that question is that you can't.
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You have to mount the SD card as a folder to the main C drive. Google should turn up the step you need to take to do this.
I have found a site with the required instructions. I will be trying the process later today and will report back once completed.
Mounting the SD card as a folder on the C drive worked, although it may be affecting performance, the system situation not being a natural one. I am also on an older slower tablet so that could be the source of the apparent slowness. I can see the problem of using an SD card as a second hard drive/SSD could become a real issue as more people begin to use the newer tablets such as the latest Microsoft Surfaces.
The answer provided by Jim Hess is actually not correct as the approach suggested by Just Shoot Me does work.