Extending uvm_seq_item

[uvm_learner]

I have uvm_seq_items as below.

class a_seq_item extends uvm_sequence_item;

  bit x;

  bit y;

  bit z;

   .............

endclass

 

class b_seq_item extends a_seq_item;

 bit p;

 bit q;

 bit r;

.......

endclass

 

I want to use b_seq_item (p,q,r vars) everywhere in my env , but p , q & r should be equal to x,y & z.

How can i assign p = x , q = y & r = z?

 

sequencer is using a_seq_item.