How do i change the target without rewriting the trigger every time.

I am trying to make it so i can specify a target and not have to rewrite my trigger every time.
My trigger is...

When this happens: You have finished modifying your ship.

I do: Buildship (shipname) (Hull/circuits/weapons/engines)

I want to know how i can specify what ship i want and what part i would like to add, and it will work that way until i change it again...

You can just edit the trigger, you don't need to create a new one each time.

you could also set up each thing (shipname, and part) as variables and then send them. The forums have many examples of this.