We are in a need to open "Quick Create" form on click of the "+" button on OOB Opportunity product subgrid on Opportunity entity.
Following things I have done so far:
Enabled Opportunity Product entity "Allow Quick Create".
Customised "Add new" button using Ribbon Workbench to add the Javascript action to open quick create form. Using this approach, I found that the JS was not getting executed.
Link referred : https://community.dynamics.com/crm/f/117/t/219639
Please help to implement the requirement and resolve the issues.