On DealPos, you can delete products or variants data in the Products menu if you don't want to sell the products or variants anymore. But, if your products or variants is ever having a transaction before, you cannot delete the product or variant's data.
To make the products or variants not available to be sold anymore, instead of deleting the products or variant data, you can try to Discontinue the product or variants. Discontinued product or variant means that your products or variants are not available for sale anymore. To discontinue products or variants, you can follow the steps below
I. How to Discontinue on Product
Step 1. Go to the Product menu, then choose one products

Step 2. Click Edit, then mark "Yes" on Discontinue

Set Discontinued to "Yes".

Step 3. Discontinuing products by import via CSV file.
If you have multiple products that you want to discontinue at once, you can try to discontinue the products by using import via csv file. First, you have to export the product, fill the Discontinued column on exported csv file to "Yes", then you can import the product csv.

Note: After marking '"Yes" on discontinue column, the products will not appear on the Product Menu.
II. How to Discontinue on Variant
Step 1. Go to Products menu, click Variants tab on Products

Step 2. Click Edit, then mark "Yes" on Discontinue

Set Discontinued to "Yes".

Step 3. Discontinued Variant by import via CSV file
If you have multiple variants that you want to discontinue at once, you can try to discontinue the variants by using import via csv file. First, you have to export the product, fill the VariantDiscontinued column on exported csv file to "Yes", then you can import the products csv.

III. How to See Products Discontinued
Click filter on Products Menu, then set "Yes" on Product/Variant Discontinued

Discontinue Product or Variant Video Tutorial
You might like to read these related articles below:
If you want to know more about Products menu, you can read this article: Product Menu Introduction
If you want to delete the product, you can read this article: Check and Delete Product with Variant