To update the inventory in your e-commerce store in Squarespace, you'll need to follow these steps:
Log in to your Squarespace account.
Click on the "Commerce" button on the left-hand sidebar of the dashboard.
Select "Inventory" from the menu.
Select the product you wish to update the inventory for.
Click on the "Edit" button.
Under the "Inventory" section, you can adjust the available quantity of the product.
Click "Save" to update the product.
You can also bulk update the inventory of your products by selecting multiple products and using the "Bulk Edit" option, allowing you to update multiple products at once.
It's worth mentioning that you can also set up low stock notifications in Squarespace so that you can be alerted when the inventory of a certain product is running low.