When you want few products to be pre-selected in cart on Product Field, select the product as a default selected within Product Field’s options.
Follow these steps below:
Step 1: Edit your AeroCheckout page, click on “Products” section.
Make sure you had selected under “Product Selection” setting.
“Allow buyer to select any of the above product(s) (e.g. when selling multiple products)“
“Restrict buyer to select only one of the above products (e.g. when selling similar products with different pricing plans or quantity) ”
Step 2: Click on “Save Products” to save changes.
Step 3: Now navigate to “Form” section and click on “Products” field.
Step 4: Click on “General” tab and using checkbox select product/s which you want to add to cart by default.
Step 5: Click on “Update” button to save changes then click on “Save Form” button to save form.
Now these prdoucts would be pre-selected in cart for ready to checkout