Hello, I am working on one project where I need to design on form where user can add multiple sale bill items and then create sale bill

How to add multiple rows of bill items, I have implemented same functionality in asp.net web forms using ViewState but how to do it using asp.net core and EF core

e.g. - https://drive.google.com/file/d/13DrTpMOe8rM0usY6VHi5yuCULvZWBJtv/view?usp=sharing

refer this drive Image, in this form user has added two items in bill but not saved in database, These items will be saved in database after clicking on submit button

How to develop same functionality using asp.net core and EF core, please provide reference