"If feasible" and "where applicable" are two common synonyms for the phrase "if possible". These expressions serve as alternatives when you want to express the idea of something being doable or achievable. "In the event that it is doable" is another useful phrase that can be used to convey the same meaning. Additionally, "assuming it can be done" and "provided it is practical" are other options that can be utilized to present the same notion. Overall, there are several synonyms available for "if possible" that can be utilized to add variety to your written and spoken communication.