Arrays, DB and pointers

Could anyone help me with this?

FIRST
I have a array of 20x30 INT elements ( this array is declared inside of a DB in Step7 ).

I need to read / write values using indirect addressing like DB1."MATRIX"[MD10 , MD20] by example... (or absolut mode db1.dbd2 bla bla bla )... Where MD10 and MD20 are numbers that I can change during the machine cycle. Is it possible?

SECOND
Another doubt: in place of MD20 from syntax above can I use a pointer P# ?

Since now thanks a lot!!!

Best regards,
edsan