I have master detail relationship between Opportunity and Work Order. There is Work Order related list in Opportunity. On clicking 'New' in related list, I want to prepopulate some fields using Opportunity values in lightning. The user must be able to change the predefined values if needed.
On researching, I found out that it can be done using Quick Actions. More information. The problem is that I won't be able to use the 'New' button of related list to create new Work Order if I am using Quick Action. Also, I won't be able to use the existing page layout.
I was looking into other ways to prepopulate field values while creating a record but did not find any. Did I miss something? Please guide.