if you want your sprite to just move up, you don't even have to use the bullet behavior.
In the event sheet create a new event and add every tick as a condition and for an action (for the object you want to move) choose set Y and write the following expression: self.Y - (any value) * dt
It should look like this:
Every tick---> Object | set Y to self.Y - (any value) * dt
This means that |every frame | your object will look at its current Y position (self.Y) | and it will subtract (move up) some value of pixels (the any value that you will set) |, which by using delta time (dt) you are making sure it will stay the same per second -no-matter the frame rate of the device that the game will be played.
Finally got it working.
thank you so much eli0s for your help, there are so much you can do with C2 on how or what approach you want your object to do, for beginners like me, learning stuff like this from C2 masters like you, would educate me more quiker on C2.
thanks again, also to keroberos & katzin as well