>Hi Craig,
>There are two grids on form. For each row in left grid could be few rows in right grid.User want to manualy reorder right grid so that allways rows belonging to first row are on the top, then follows rows for second left row, and so on ... They don't want an additional field which can connect rows in whatsever order in right are they.

They don't want to SEE any additional field, but what's stopping you from actually having that field? Just don't show it on the grid.