The IsoRite multilateral completion system provides through-tubing re-entry capability in TAML Level 2 and 4 wells, eliminating the need to pull the upper completion. Re-entry access to the lateral improves the efficiency of future workovers and intervention operations, saving rig time and costs. The IsoRite system incorporates a completion window equipped with a landing profile and sealbore that enable the setting of a deflector for lateral access or an isolation sleeve for lateral control. Optional intelligent completion interface allows for monitoring and flow control of each lateral branch. This incremental modular system can be used to upgrade existing junctions.