Idea for variable dice damage with variable damage type

Kinda a complex issue(to me) but something I'm determined to seek out an answer for as the alternative is having like 10+ damage entries for a single spell. 

The structure of the attack goes as follows: First I choose the weapon I am attacking with, which all have different damage die then I choose an elemental damage type that deals in place of the weapon's normal damage. 

What's the best way to got about this? I've basically never touched macros before nad I got the jist of how things are supposed to be structured from reading the wiki but I'm not quite sure the best way to do it.

Which character sheet are you using? If you don't know please supply a screenshot. 

Could you detail the attack further? Is it just select weapon then select damage? 

Which 5e sheet are you using? (there are around seven 5e sheets at this time)

I'm not sure? It's a brand new campaign and the GM (and all the users) are non-premium/subscriber/anything involving money afaik. Is ther some way for me to check?

Sneaky D. said:

I'm not sure? It's a brand new campaign and the GM (and all the users) are non-premium/subscriber/anything involving money afaik. Is ther some way for me to check?

Please screenshot the character sheet and post it, we can identify it that way.

Ok, that is the 5e by Roll20 sheet. 

To make sure I understand correctly, the variable component is the damage type? The weapons themselves do not change?

Assuming the above is correct there is no easy macro solution. 

Problem 1: Any macro that is built would be a snapshot of your weapon attacks. As a result, the snapshot would be inaccurate the moment you changed a weapon. 

Problem 2: If the macro instead called the weapon attack, that avoids problem #1 but that wouldn't change the damage type. 

So I see a few possible solutions: 
1) Ignore problem 1, just make a generic attack, let you select strength, dexterity, or you spellcasting ability (if applicable). 
2) Ignore the macro option altogether, simply put in a Global Attack Modifier that creates a note about the correct damage type. 
3) Add a query to each attack to switch the damage types. However, this would function even when the spell is not being cast. (Although the default can be set to the weapon's default so it just becomes a single extra keypress.)
4) An Mod (API script) could probably handle this, but it would require the owner of the game (your DM probably) to have a Pro account. 

#2 or #3 may be your best bet. 

Two sounds within my speed. Thanks man.

Correction on my part, I should've said Global Damage Modifier, not Attack.