Add time to Original Estimate of Task B if Original Estimate is reduced on Task A

[Eydie Fitzgerald]

Hello,

I'm really hoping that someone out here has accomplished something similar to what I'm trying to do.
I am easily able to reduce time on Task B if a spike task (Task A) is created.  This works perfectly.  I was then asked if it was possible to put time back to Task B if Task A time was reduced.
Scenario:  I create a Spike and I estimate the time will be 4 hours.  I was able to complete that spike in 2 hours.  So I update my original estimate on my spike from 4 to 2 hours.
I'd like automation to add those 2 hours back to Task B.
The best I've been able to do is add All of the Time tracking time to Task B.  
I reduce Task A from 4h to 2h, the remaining time is still 4h.  The automation will add 4hours to Task B.  Great, some success. 
It doesn't seem to matter what variables or logging I create, it's never capturing the 2 hours I reduced.
I have tried so many variations.  I've learned a whole lot more about Jira automation.  This has been great!  
I've deleted all of my tests out of frustration.  :-)
Again, very hopeful that someone has been able to do this and will hopefully suggest some answers.  Thank you!

[Bill Sheboy · Accepted solution]

Hi @Eydie Fitzgerald 

Have you tried updating the Remaining Estimate directly in the Task with a JSON edit?

https://support.atlassian.com/cloud-automation/docs/advanced-field-editing-using-json/#Time-tracking-and-logging-work

Kind regards,
Bill

[Eydie Fitzgerald]

Thank you Bill.  I'm new to the advanced options.  I have yet to be able to do those.  
When I add the JSON to the Automaton, I used to get an error.  But it appears I have the ability to do so now.  
I'll give this a shot.  If successful, I'll be back to mark this as accepted answer.

[Eydie Fitzgerald]

I successfully removed time from Task B when it should have added time.  

[Eydie Fitzgerald]

I'm certain this is the answer.  I'll keep plugging away at it.