Subsea engineering is a vast field for the design, analysis, construction, installation and integrity management of subsea trees, tie-in connection, manifolds, jumpers, wells. The subsea technology used for offshore oil and gas production is a highly specialized field of application that places particular demands on engineering which carries some unique aspects related to the inaccessibility of the installation, operation and servicing. Tie-in connection systems are used to connect various subsea production system components like tree to tree, pipeline end to tree or manifold, tree to manifold. This article demonstrates design and analysis of scale down parts of tie-in connection system. The FEA results indicate analyzed parts are safe under required standards which further validated by numerical calculations and testing.