HP 40gs how to get a submartix from a matrix

[Anthony The Koala]

I have a 3x3 matrix:
M1 =
1,2,3
4,5,6
7,8,9

It is stored as:
[[1,2,3],[4,5,6],[7,8,9]] STO M1

Display M1
M1 ENTER

How do I get a sub-matrix such as:
M2 =
5,6
8,9

Are there any column and row operations or any indexing operations in order to get a sub matrix M2?
By indexing operations, using index and row column numbers as in arrays in python, matlab.

Thank you
Anthony of Sydney