Add the Custom row and Column in one matrix Table.

[Raja10ram]

Hi community, 
is it possible to add a custom row and Column in a matrix table?
Here, i had attached the Dummy Excel sheet format.

Weekly i have to show the SCN value but plant and Mgt SCN value shouldn't show weekly,

then i have to add the Two rows after the Total Chk = base and Diff = Spares,

1) Chk = base should be the some other value

2) Diff = Spares should be (Total - Chk = base)

3) same plant and mgt SCN value should be calculate in those two rows.