Optical phased arrays (OPAs) have broad application prospects due to their advanced capability in beamforming and steering. In this work, we achieve independent dual beams in the far field by dividing the array elements of the OPA. Based on the working principle of OPA, theoretical considerations of such a multi-beam generation are presented. A phase data allocation approach for OPAs in presence of fabrication-induced random phase variation is developed. Simulations of large ensembles of OPAs with various levels of random residual phase errors have been conducted to help analyze the results. This approach can help OPAs to realize multi-beams for light detection and ranging (LiDAR).