Can we sell promotion coupon(price is zero $) at POS?

Can we sell promotion coupon as item at POS?

1) Login to POS

2) Scan coupon item(which is price 0$)

3) Then click Tender

4) Application completing sale with 0$

Question here is whether POS allows to sell only Promotion coupon as item at POS without the items linked to Promotion.

Kindly suggest.

Thanks & Regards,

Naveen