Stacking Manyshot v1.0 needs 3 level hero ability

[danacm]

i found a spell Stacking Manyshot v1.0 with is a unit ability, but i need a 3 level hero ability.
https://www.hiveworkshop.com/forums/spells-569/stacking-manyshot-v1-0-a-169540/

Can somebody help me, and create this ability?