A method of video processing includes: determining an affine mode type to be applied to a current block coded in an affine mode in a video frame, wherein the current block is split into a plurality of sub-blocks; and deriving motion information for each of the plurality of sub-blocks based on the affine mode type, at least one control point (CP) motion vector (MV) at a specific location being derived and stored for predicting other blocks to be processed subsequently.