I have two related lists (parent-child relationship) in my SharePoint 2013 site.
The child list contains a lookup column containing the unique titles that exist in the parent list. I have added the related child list as a web part to the parent list's default display form. When a parent item is opened, the child items are filtered accordingly.
Is there a way that I can allow the summary toolbar on the child web part so when a user clicks on the "add new item" link, the parent title is passed to the child's New Item form so I can automatically set the lookup drop down box to the proper selection?