I'm not sure I understand ... what is wrong with keeping it right where it is ?
How big is the SSD ? If it can fit windows on it, disconnect the data cable from the HD
1. Prepare for Windows installation with USB tool
https://www.microsoft.com/en-us/download/windows-usb-dvd-download-tool
2. Connect boot SSD drive data cable to lowest numbered SATA port .... but don't connect:
-Ethernet cable
-SATA Data Cable for any other drives
3. Install Windows to boot drive
4. Turn off Windows ability to install Hardware drivers
https://www.tenforums.com/tutorials/48277-enable-disable-driver-updates-windows-update-windows-10-a.html
http://www.sevenforums.com/tutorials/82137-drivers-turn-off-automatic-driver-installation.html
5.
Install all hardware drivers from original media in boxes See Item 7 below
6. Connect ethernet cable and run Windows Update till it stops doing anything
7. Install latest drivers for ALL hardware from manufacturers web sites. The reason we didn't do this in step 5 is 3 fold:
-Sometimes MoBo CD comes with licensed utilities with product key embedded and these are not on web site versions
-Its advisable to establish a working out of box conditions
-Sometimes newer drivers require latest Windows Updates
If you have a 2nd drive ....
8. Shut down and connect HD data cable to 2nd lowest numbered SATA port.
9. Boot to BIOS and make sure that SSD is the 1st boot device, if not fix it
10. Boot to Windows
Now you can go about getting rid of the old Windows install on the HD and anything else you don't want anymore. To set up your programs on the new OS, just reinstall them over themselves in the existing locations on the HD. This will maintain all user customizations.