Checkbox selection section wise in tableview swift4

I have data having categories and its subcategories. There is no problem to populate all these data. But problem is of selection. User can only selects subcategories and its having checkbox button. So for this purpose I have made category name as section and subcategory as a cell (having checkbox button + subcategory label) . When user selects any subcategory then it should select section (category) wise. But here problem is that category is having different Id, but similar subcategories in different sections (category) having same Id. Can anyone give me the solution of this?