How can I do parent/child in the bootstrap multiselect ?

I am working on MVC 5,

How can I bind a category and sub-category to be shown in the same bootstrap multiselect dropdown ?

Here is the table structure and table name is 'productcategory'.

View,

"~/Scripts/bootstrap-multiselect.js">

@Html.DropDownListFor(model => model.ShowAdConfigIDs, ViewData["Products"] as List<SelectListItem>, new { @id = "DDLProductCate", @class = "form-control", @multiple = "multiple" })

How can I do this, inside the same DropDownList's ViewData["Products"] using C# LINQ query ?

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