Message sending damage?

Ok, I’m making a game right now, and I have one enemy so far that does five damage to the character. Well to do so it sends a message to Health on the main character, but I’m going to have more enemys in it soon, and I don’t want to have to add a new message sensor and property actuator for each kinds of damage they all do, so I was wondering if there was a way to get a value from a property on an enemy that gets sent with the message saying damage, and then will subtact that amount from her
“Health” property.

is there a way to just send a property amount with a message and have it reduce by that much? Thats all I really want to know.