Still trying to figure out rolling budget based off of linked tickets

[Scott Federman]

So I’ve come close but no cigar. I could really use some help with the scripted field. I have an issue type called project budget. In this issue type is a number field Called budget and another scripted field called remaining budget. Linked to this issue type is an issue type called order request which uses the relates to link type. In this issue type I have a scripted field called total order expense which calculates all the expenses from their associated sub task. What I need to do is be able to subtract the total order expenses field from all of the order requests linked to the project budget from the the budget Field in the project budget and return the remaining budget value. I’d like to do this using scriptrunner. Could somebody help me out?