Lattice-based design is an emerging capability that holds a promise of control over the shape and geometric parameters of each the unit cells that construct a structure, toward tailored optimized solutions to challenging requirements. However, lattices have many features and geometrical entities that rapidly increase with the number of unit cells. Currently, there are not many Computational Aided Design (CAD) software tools that can model lattices with many unit cells, and also support transfer of models to commercial Finite Element Analysis (FEA) software in a format which allows efficient computations. In addition, geometric modelling tools lack inherent embedded tools for Design for Additive Manufacturing (DfAM), for technologies such as Laser Powder Bed Fusion (LPBF), which is an enabling manufacturing technology for lattice structures. In this study, we compare FEA analysis in Ansys® software with CAD models that are created via the V-rep based IRIT® software, which was developed at the Technion IIT, and the Solidworks® software. The results demonstrate the advantage of IRIT® that can directly generate parts from unit cells that seamlessly transfer to Hexa mesh in Ansys®. Thus, allowing for efficient FEA computations of complex hierarchical lattice structures, which are constructed from multiple unit cells.