How to use a multi-instance keyword in a calculation

[John_Matyasovsk]

I am making a purchase request form.  On the form I have standard multi-instance keyword group for quantity, price and extended price.  I need to be able to do two things.

1. calculate the extended price by multiplying the quantity by the unit price.

2. Calculate the total cost by adding all instances of the extended price.

I do not know how to do this.  Any help would be great.

  

[John_Matyasovsk · Accepted solution]

Never mind everyone.  Answered my own question.

Autofill keyword set can be used in calculations with Custom actions.  Just make sure that the keyword types are compatible.