The best thing to do is to reinstall the games and set them directly into your hdd. I understand if you have mods, saved games etc but you can always copy those files and post them to their appropriate locations via usb. This said, it's pretty easy in windows 8 to change the default location of the public folders.
First right click on the library you want to change the default public folder for eg documents, music, pictures, or video. Next click "set public save location" and set it to the drive you want it. I know that in terms of the homegroup or network it utilizes the user which is located on the "c" drive or os drive which in this case is your smaller ssd but you want files to be placed on to the hdd. By setting all of these (public docs, music, pics, vids) to your larger hdd as the default public folders you will also see them in the homegroup.
For example, I have my laptop with windows 7 on the same network as my gaming rig with windows 8. I can easily place any file from my win7 laptop to my win8 rig via the network and I have all my public folders set to my hdd instead of my smaller ssd.
This may not be the exact answer you are looking for but it is a solution. Hopefully you find it useful.
Alternatively, you can use a cloning software but I tend to hesitate on things with product keys as sometimes they are developed in a way to "fight" cloning. I've found it just easier although a bit more time consuming to just re-install the games directly to a new drive to avoid any potential issues. Cloning should work perfectly fine in theory and tends to do well with paid versions. I paid the $40 for acronis and it's been a charm but I'm not trying to recommend a solution that costs you money at the moment.