How to create a macro for this ???

Hi there,
I tried to create a MAC but it 's seemly impossible.I want to change DTRX (like TYPE,STYP...) not SPRE (ATT of ELBO).
Any one here know how to change them ?
Thanks

Hi there,
I tried to create a MAC but it 's seemly impossible.I want to change DTRX (like TYPE,STYP...) not SPRE (ATT of ELBO).
Any one here know how to change them ?
Thanks