3.5e 2d6 or 3d8

i am trying to figure out a macro for one of our PC to help the game move faster he has a attack that once a target becomes hit by his first round he does more damage the next round is there a way without building 2 separate weapon slots for every weapon to make it roll 2d6 or 3d8 if already empowered thanks for the help in advance

I don't know how that character sheet and template are set up, but is there a place to add another damage roll so that it displays both all the time and you just take the one that applies?

we are using the D&D 3.5E Authors: Diana P. current macro I am using is 1d10 + @{weapon1damagestat}[Weapon Dmg Ability] +@{weapon1enh}[Weapon Enh] +@{weapon1specialize}[Weapon Spec] +?{Apply Thunder Arrow?(1 to apply)|0}*(2d6)[Thunder Arrow damage] but i need a option to change the 2d6 with 3d8 but only with the stat that applies I understand the basic macro write up but adding a choice of different dice I'm not so sure about there is no place to change the damage dice with out just rewriting a macro

Try changing your query to a drop down query with the 3 options: +?{Thunder Arrow?|Normal,(2d6)[Thunder Arrow damage]|Empowered,(3d8)[Empowered Thunder Arrow damage]|No,0}

Thank you Diana P! Your recommendations worked perfectly.