sometimes we want to export a vertical aspect for socials from a horizontal sequence. for instance, we have worked in the timeline or sequence which is 1920×1080 and everything is picture locked! we just need to export a vertical version of our project (for example 1080×1920) from that sequence without needing to change aspects of the sequence. just like the slice tool in Photoshop! we just click and drag the slice tool to the area we want to export or put exact numbers of width and height.