We received a package of oranges and grapefruits from Israel. How would I go about taking Trumot and Ma’asrot from it? Do I have to take the tithes from each fruit separately or can I take it together?

If we are referring to one package of oranges, you can take Ma'asrot from one of the oranges for all of them. If from different shipments, Ma'asrot must be separated from each shipment. Oranges and grapefruits are different species and must be tithed separately.