How do I save a table in a database using a ViewModel database-first approach?

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C#

VB

ASP.NET

MVC

I had an MVC application to update a table in a database, but now I needed to add a ViewModel so that I could have the multiple tables displaying on a view page. But the problem now is that it will not save into the database now. I am using database first approach (not code-first).

Here is what I have so far:

In my ViewModel:

Public Class ClientUserProjectIssue
    Public Property uTable As UserTable
    Public Property issueType As IssueTypeTable
    Public Property IssueTable As IssueTable
End Class

In the view:

@ModelType IssueTracker.ClientUserProjectIssue

@Html.EditorFor(Function(model) model.IssueTable.IssueSummary)
@Html.EditorFor(Function(model) model.IssueTable.IssueDescription)

In my controller:

Public Function UpdateIssue(issue As IssueTracker.ClientUserProjectIssue, objModelMail As IssueTable, command As String) As ActionResult

dbServer.Entry(issue).State = EntityState.Modified
dbServer.SaveChanges()

I will now get a null value because I am using the ViewModel instead of a single table.
I was trying to implement something like this:

Using context As New DbContext()
    Dim dataModel As DatabaseEntities= context.IssueEntiteis.where(Function(x) x.Id = viewModel.Id).First()
    dataModel.Name = viewModel.Name
    dataModel.Type = viewModel.Type
    context.SaveChanges()
End Using

But I was getting errors so I am pretty sure I can't do it that way because I am using database first, how can I implement a viewModel so that I can save tables in a database?