Drop down selection menu of static mesh from only specific path in detail panel in unreal using C++ or blueprint in UE4.13.0

Hi, I am new to Unreal Engine. I want to make drop-down selection menu of static mesh in detail panel same as inbuilt static mesh selection menu (as shown in picture). Inbuilt selection menu shows all static mesh from all location but I want to show static mesh only from specific location.

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Basically I have some category and some static mesh for each category. For Example, On selection of Category 1, It will show static mesh only from location Game/MyMesh/Category1. same as for Category 2 and 3 and so on.

I have tried Enumeration and Data Table to show drop-down selection menu in detail panel, but I need to predefined a static mesh list. It doesn’t show in drop-down menu automatically when I add a new static mesh to that location.

So, Is there any way to do that? If yes, how to do that using Blueprint or else C++?

Thank you in advance.