Advantage on an advantage

[Gary]

Is it possible to put an Advantage on another Advantage instead of the base power? For example, a character who purchases Explosion on his Str. The character wants to have Personal Immunity to just the Explosion part of the Str, but be vulnerable to Backlash from an Entangle for example.

[Steve Long]

Sure. That makes the most sense if it's a naked Advantage (as it would be with STR), but you could still run the math to figure out the cost for a regular Advantage, if your GM permits.