using submatrix

Hi everyone 

If a have a nested matrix like this one below 

and I want to exclude the first row  of each small matrix in the original one 

How can I do that , when I try (submatrix function) it excludes the first matrix , but I want to exclude the first row of each matrix 

by the way my ORIGIN =1 

I'm expecting the answer to be like (X sub ) in the second picture 

Thanks 

Yusra