I don't think a graft with a lot of leaves left on it will survive--you just can't get enough support through the connection until it has healed.
If you want to keep the existing limb beyond a bud graft (T-bud or chip bud), that is possible. If your bud takes, you can force the bud using the tie down method or the notch method without removing the limb beyond the graft.
If you select a limb that is horizontal or pointing downward and place the bud on the highest point, the bud may break without any forcing required. I have had that happen a couple times.
_________________
Skeet