ASP.NET

• Provide ID
• Define a datasource - a list
• Populate list with fixed 10 numbers starting from z. for first loop z goes from 1 to 10, next 11-20...
• Bind the datasource to dropdonw
• Add the dropdown to the defined panel/placeholder in UI

CREATE TABLE [ForTest](
    [id] [int] NULL,
    [id2] [int] NULL,
    [vak] [varchar](50) NULL
) ON [PRIMARY]
GO
SET ANSI_PADDING OFF
GO
INSERT [dbo].[ForTest] ([id], [id2], [vak]) VALUES (1, 1, N'abc')
INSERT [dbo].[ForTest] ([id], [id2], [vak]) VALUES (1, 1, N'xyz')
INSERT [dbo].[ForTest] ([id], [id2], [vak]) VALUES (2, 2, N'pqr')
INSERT [dbo].[ForTest] ([id], [id2], [vak]) VALUES (2, 2, N'mno')

SELECT
 distinct   P.id,
    STUFF
    (
        (
            SELECT ',' + vak
            FROM ForTest M
            WHERE M.id = P.id
            ORDER BY id
            FOR XML PATH('')
        ), 1, 1, ''
    ) AS Models
FROM
    ForTest P