Simplistically, pruning damaged limbs back to the next healthy limb or branch collar will suffice for most trees. However, because of the extent of damage to some trees, proper cuts and pruning methods are more important than ever to minimize the effects of stress and potential infection from disease and insects. Because this is a fairly rare event in our area, information on how to deal with ice-damaged trees is limited. However, I have gathered some information from the University of Maine Cooperative Extension Service that is very helpful and has some good diagrams. This may warrant consideration on older, more valuable landscape trees if the damage is not excessive.
Tree cabling and bracing involves the installation of hardware in trees.
Any time hardware is installed in a tree, there will be wounding and the risk of decay. Cables are installed to provide extra support. When used wisely, they may extend the life of the tree or make it safer. In determining whether cabling is warranted, the condition of the tree should be considered. It the root system is not structurally sound, or if the tree contains excessive decay, removal may be preferable.