Having read through the post again -

If you are using over size pieces then that is where offsets can come in again. If your wood can fasten in two different positions, one hanging of left and the other hanging of right, then you can either write two programs. Start the first program with your wood in one position. Use  say G56 offset to bring you cutter to the correct start point for that. Let it cut, then move the wood to your second start point and use say a G57 offset for the second program and cut the rest.

Once you understand offsets, you can do all sorts of things to enhance your work