How to Change Default Quantity from unlimited to 1

Hello,

We aren't sure to understand your needs well, and so 2 answers :
1. You want define a limited quantities per product :
=> From Main HikaShop Configuration => Products dropdown, select Products, then click the product name to edit.

Hi,

You can edit the file product / form.php via the menu Display>Views.
There, at the beginning, you can add that code:

<?php if(empty($this->product->product_id)) $this->product->product_quantity = 1; ?>

Hi,

For the variants, first, please note that if you leave their stock to "unlimited", the variants will automatically share the stock of the main product. So you might actually not need to do anything.

Also, the variants are generated automatically when you use the "add variants" button of the product edit interface.
And HikaShop will let MySQL set the default product_quantity based on the default value of that column in the database.
So if you want to change the default from unlimited to another value for variants, you can go in your PHPMyAdmin (access provided by your hosting), open the structure of the hikashop_product table, and edit the column product_quantity. There, change the default from -1 to the value you want and save.