Feb 19, 2020 10:24 AM|Yongqing Yu|LINK
This is a common requirement of adding data in mvc.
At this time, you need to ignore the multipletables model, and then you can use add button creates its click method in js and calls ajax to pass your new data to the controller.
At the same time, you can use the modal pop-up box of bootstrap or a new view to fill your new data.
There are many similar cases on the Internet. You can refer to the following links:
CRUD Application In ASP.NET MVC With Entity Framework