How can i make a Discount coupon be on certain products or departments?

This can be done by going from the control panel into marketing then coupons then pressing to create a new coupon as shown in the following picture

Then going into general setting of Discount coupon, which are used to put the name of Discount coupon and the code and choose the type (whether percentage or fixed amount) .. and Determination The date of start and end ... and the number of times use of this coupon and also the number of times used for the client. Then put the products or sections designated ... then save .. as shown for next picture.

The Coupon Code is then sent to your customers through  e-mail ...