If you declare a variable inside the procedure they you can refer the value or assign the value only from that stored procedure, its called local variable.

If you want to refer a same variable from different procedures or functions or packages then what we should do? We should declare a variable in a package spec so that we can refer that variable from any where we want in the Pl/SQL block.

Now we will take an example of a package spec.

CREATE OR REPLACE PACKAGE pack_glb_example IS
     --We declare a cursor in package, so we can refer this cursor from any procedure or function.
     --If you declare this cursor inside the procedure then you can refer this cursor with in the stored procedure.
    --Its global cursor
    cursor c_check_cust_no ( v_cust_no number ) is
    select 1 from customer where customer_no = v_cust_no )
    --Global variable
    var_cust_hold number;

    procedure delete_customer( cust_no number );

    function get_customer_name ( cust_no number) return varchar2;

END pack_glb_example;