Inventor's Focal Sword
(2), [Activate] >>> If target ability is attached to a hero or ally, attach it to another hero or ally.

Fireball
Attach to target hero or ally, and your hero deals 4 fire damage to it. Ongoing: At the start of your turn, your hero deals 1 fire damage to attached character.

Question:
Does Fireball deal 4 damage whenever I use the Sword to attach it to another target?

Help would be appreciated, Thanks

No, Fireball does not deal another 4 damage when it is moved by the effects of Inventor's Focal Sword as in is not being re-triggered.