asp.net core razor pages. add an input value to two different tables

Question

I have a form with one input but I want to save the data to two different tables

 

<input asp-for="PTWHandover.StartDateNew" class="form-control" style="background-color:aqua" />
                    <input hidden asp-for="PTWContent.StartDate" />

What should add to hidden input to have it performing the add?