Split model

I'm new in 3d printing and Tinkercad. 
I have a general question about Tinkercad. When I import a model for example from the internet I get a solid model. It is one group. Suppose I have a download a plate 10x10x4 mm. And I wont split these plate into two parts, and work on each separate.

Is this posible in Tinkercad?


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