Percentage Based Options

[Rocketz]

I want to offer a service addon that is a % of the main package value

 

For example, I have 5 products that are different pricing. Let's say 10 dollars, 20, 30, 40 and 50

 

I want to create 1 option, which would be a % for each. So let's say I want it to be 10% of the main package pricing, the option, if selected with a product would be 1 dollar, 2 dollars, 3-4-5 and so on. 

 

This would avoid creating an option for each product, which gets tedious and hard to manage. 

 

I'm not seeing how to do this right now. Any help?  

[Michael]

There's no default option to do this, you can hack the core but this is a nice feature request.