It is possible to combine genioplasty and mandibular implant surgery in the same sitting, but this will depend on a number of factors, including the extent of the surgery, your overall health, and your surgeon's preference. Genioplasty involves reshaping the chin bone to improve its projection, while a mandibular implant involves placing an implant to enhance the jawline and create better symmetry. Both procedures require incisions and manipulation of the facial bones, which means that there may be some overlap in the recovery process. Combining the procedures may offer several benefits, including a shorter overall recovery time, lower cost, and the ability to achieve more comprehensive results in a single surgery. However, it is important to note that combining procedures may also increase the complexity and risk of the surgery. It is important to discuss your goals and concerns with a qualified plastic surgeon who specializes in facial surgery. They will be able to evaluate your individual case and recommend the best course of action to achieve your desired results, including whether or not it is appropriate to combine the procedures in a single surgery. They will also be able to provide you with detailed information about the recovery process and any associated risks. I hope this helps, best of luck !