archery system???

[Masta21]

is there a archery system done in gui for using an item?

like say i have a bow in my inventory...i click the bow..click a spot..the arrow will shoot straight and hit anything in it's path.

 

[SlayerII]

Simple way:
Give the item a abilty based on shokwave and change the missle to a arrow

Harder way:
Give the item a abilty based on healing ward change the unit to a invisible dummy.
Then you have to use a knockbacks system.
When someone use the spell you create a dummy unit which have the modelfile of a arrow and send it to the point with the knockback system. Everytime the system pulls the arrow you chek if a unit is nearby. If one is nearby damage it and then kill the arrow dummy(or not if you likr it to go further but then i would suggest the simple way)