Can I tweak the 3.5 character sheet?

I would like to modify the weapon1-5 macros so the player can target a selected token with the selected attack and it will automatically compare the attack to the AC and if possible it would be nice if the macro subtracted the damage from their HP as well.

Moved to the Character Sheets forum.

You can modify the macro to anything you would like. If you need more room to edit the macros, grab the diagonal lines in the corner and pull the input box to be larger. Any adjustments you make to the macro on one sheet will not copy over to other sheets without modifying the HTML code (which requires Mentor access) so you'd have to copy it to all of your character's sheets manually. I don't have that coded in as default since not everyone wants their players to know the opponent's AC's. However, without using the API, you won't be able to get it to subtract damage from HP or modify any other attributes.

Thank you, Diana for the information. I was hoping I would be able to do so without having to insert it manually, but oh well. You do make a good point about not wanting players to know the AC. I was thinking maybe I can make the entire event into a /gmroll, but then players might get bored from not seeing anything at all, So I'll just add the ability to target a token into the macro.