Dynamic Query

hi,

i want to make dynamic query..

presently i am having query like this..

modify ztab1 from wa1.

modify ztab2 from wa2.

modify ztab3 from wa3.

now i want to pass table name and wa in variable assume

v_wa = wa1.

v_tab = ztab1

modify v_tab from v_wa.

v_wa = wa2.

v_tab = ztab2

modify v_tab from v_wa.

v_wa = wa3.

v_tab = ztab3

modify v_tab from v_wa.

i am not able to do this can somebody help me out...

thanx

abhishek suppal