flying ridable entity

im making a ridable flying mob, but i cannot make it go up and down.  tried using this post: (1) Pylo on X: "With all the new features coming in 2020.3, many new things will be possible. Planes and helicopters, for example. Stay tuned, the pre-release is very close ;) https://t.co/f6BT4RLR8u https://t.co/Frq6QfXP38" / X but i couldn't find the "set movement vector to vx" block. thank you for help