Razor code

var customerForm = new FormModel(DataSourceType.SQLite, "Northwind", "Customers") { Insert = true, Delete = true, Caption = "Customers" };
    customerForm.Columns = new List() {
    new FormColumn("CustomerID") { TextTransform = TextTransform.Uppercase},
    new FormColumn("CompanyName") {Required = true},
    new FormColumn("ContactName"),
    new FormColumn("ContactTitle"),
    new FormColumn("Address") { ColSpan = 2},
    new FormColumn("City"),
    new FormColumn("Region"),
    new FormColumn("PostalCode"),
    new FormColumn("Country"),
    new FormColumn("Phone"),
    new FormColumn("Fax")
};

var orderForm = new FormModel("Orders") { Insert = true, Delete = true, Caption = "Orders" };
orderForm.Columns = new List() {
    new FormColumn("OrderID"),
    new FormColumn("CustomerID") { ForeignKey = true, DataOnly = true},
    new FormColumn("EmployeeID")  { Lookup = new Lookup("Employees", "EmployeeID", "LastName || ',' || FirstName"),Required = true },
    new FormColumn("OrderDate"),
    new FormColumn("RequiredDate"),
    new FormColumn("ShippedDate"),
    new FormColumn("ShipVia") { Lookup = new Lookup("Shippers", "ShipperId", "CompanyName"),Required = true },
    new FormColumn("Freight") { Format = "c" },
    new FormColumn("ShipName") { ColSpan = 2},
    new FormColumn("ShipAddress") { ColSpan = 2},
    new FormColumn("ShipCity"),
    new FormColumn("ShipRegion"),
    new FormColumn("ShipPostalCode"),
    new FormColumn("ShipCountry")
};

customerForm.LinkedControl = orderForm;

productsGrid.LinkedControl = productForm;
<div style="display:flex; flex-direction: column; gap:10px;">
    <div>
        @(await new DbNetSuiteCore.Control(HttpContext).Render(customerForm))
    </div>
    <div>
        @(await new DbNetSuiteCore.Control(HttpContext).Render(orderForm))
    </div>
</div>