I am new to zen and have looked up and down to ascertain how I can add a "sub" option or atribute to be used with stationery, more or less as follows:

Return address on envelopoes
Include return address select one No Thankx
yes for 11 set $22.50
yes for 2 wets $36.00
yes for 3 sets $49.50

if answer is yes, after choosing price, then another otipn is displayed:
line 1..................
line 2.....................
line 3.....................

Thanx in advance