Dropdown menu is to be toggled

I’m new to Bubble. I want to create a dropdown that has four static main categories, say, A, B, C, and D. Then each main category has subcategories, say, A1, A2 …,A50 ; for main Category B, subcategroies B1,B2,…B100 and so on for C and D. As the list is huge, I want to initially show the four main categories (not showing the subcategories when the main page loads) and toggle the subcategories. I am unable to do that.
My second problem is that I don’t know how to use the search when I want to search by typing the subcategories at the placeholder of the dropdown.
Please help me.

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