How can I generate a discount code for 25% off the slatwall order?

You can have 2 different scenarios for this.

Scenario 1:

The customer wants an additional 25% discount for slatwall on top of his cabinet discount. If this is the case, please refer back to the question called "How can I add more of a discount than reflected in the customers cart?"

Scenario 2:

To generate a discount code for ONLY slatwall, you have to go to the "discount" tab in Shopify, create a new discount. Enter all of the information like you normally would, but under the VALUE box, you want to select for the discount to apply on specific collections. Search the word "slatwall" and select every category that has the word. THis means that the customer will only be able to use this discount for slatwall and accessories and nothing else. IT IS IMPORTANT THAT YOU DO THIS.

Once you are all done with filing in the informaiton, you can create the discount code and just copy and paste the code to your customer.

For a detailed explanantion on how to create discounts, please go to the question called "how do I create a discount?"