Copy / Move field values from one table to another

Hi,

I have 2 tables:

• task table (task)
• reason for change table (u_reason_for_change)

I have fields named "executive summary" and "cause of outage". Once I input one of those in task fields and submit the task, it was not copied in the reason for outage fields named "executive summary" and "cause of outage" also. Can you give me a idea on how to do it? Thanks.