Q: How do i move pictures from my iphone 4S to my computer?

Photos that exist in the Camera Roll on the iPhone are moved to the computer via importing, using an import utility on the computer, depending on the computer OS. What computer OS are you using? Import photos and videos from your iPhone, iPad, or iPod touch to your computer - Apple Support

Photos that have been synced to the iPhone from the computer are removed using the same process, a sync. See this support document for assistance with that process. Sync photos from your computer to your iOS device using iTunes - Apple Support  See the section on Delete Sync Photos.

You can delete the photos in the Camera Roll individually, or remove them using the photo utility you used to import, just check off to delete after the import.

Sorry, I've been gone. When you connect a device to Windows 8.1 and it has content on it, then it should recognize that it is a camera, and allow you to import the photos. iTunes does not import photos. If the import utility does not start, or you are not prompted to import the photos to the computer, then you can go to Computer, find the iPhone listed in removable devices, and then right-click on the device and select to import the photos. If the standard import utility opens, then you should see an option to delete the photos once imported. If you do not see that, you would have to delete the photos individually on the iPhone. Let me know if you have any additional problems.