How to Remove static meshes which are placed by data table

I have an actor blueprint, which places static meshes in the level via data table and csv coordinates like in the picture below.
what i want to do now, is to remove on keyevent all these generated meshes but not the blueprint itself

the next step is, to change the csv data, and reload it again to have another arrangement of meshes.
but at first i have to get rid of the old meshes.

my problem is, that i dont know how to call all these meshes (from row x to row y) because the data table seems to be not a real array.