I have an existing gas fireplace place in my home that I moved 1'0" to the right. There is a copper tubing with a shut off and then flex tubing connecting to the fireplace. I am trying to add additional copper tubing on to the existing so I can extend everything to reach the new location for the fireplace- Can I achieve this easily?

The best way would be to buy a longer flex tube but if that's not possible a copper flare coupling is the fitting you're looking for. Test any new joints by painting the joint with a mixture of dish detergence and water. If you see bubbles you have a gas leak. Good luck, Tom