How do I create an MVC 'view model' at runtime

See more:

MVC4

Hi A bit new to MVC but getting there:)

I have a base model

public class FgtDataEntryBaseModel
{
    public long FgtDivisionId { get; set; }
    public long FgtDepartmentId { get; set; }
}

I wish to add additional fields to this I assume via 'View Model' depending on what the user selects at login.. The number of FgtCtrActxxx fields can vary from 1-999

public class FgtDataEntryNewViewModel
{
    public long FgtDivisionId { get; set; }
    public long FgtDepartmentId { get; set; }
    public long FgtCtrAct1 { get; set; }
    public long FgtCtrAct2 { get; set; }
    public long FgtCtrActxxx { get; set; }

I would then file the 'view model' with the relevant data and bind the list to the grid..

I hope I have explained myself enough here?