Try this page at Windows Central. It offers a nice step by step procedure to install programs or save files to a secondary drive. And this page at the MS forum may help as well.
Hello,I have an Alienware Aurora R3 using my SSD card for storage. How do I switch to my HDD I have in pc I’m using Windows 10? If anyone can help me many thanks. 
Aurora R3, switching from SSD to HDD