Enable Add-To-Cart for Zero Stock - Materialize Theme
Materialize template (v.0.80.4) for OpenCart 3.0.x
Credit goes to : Trydalcoholic for the perfect and professional opencart theme

As many stores especially in manufacturing industry or custom design shops, the goods will be made after received an order (Make-to-order - MTO) instead of keeping in stock or made prior to an order (Make-to-Stock - MTS).

In this case customers need to possible to ordering the goods with the availability status of "Pre-Order" or "0" stock.
This extension will be applied to above purpose by enable Add To Cart on the store.

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Installation:
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1. Login to OpenCart admin panel -> Extensions -> Extensions Installer -> Click on the upload button -> Locate the installation folder of the extension you are going to install > Open the folder that corresponds to your OpenCart version and select "enable-addtocart-zero-stock-materialize.ocmod.zip" file from FILES TO UPLOAD folder > After clicking “OK” your extension will be uploaded and a “success” message should appear.
2. Extensions -> Modifications -> Click blue Refresh button on the top right corner to regenerate cache.
3. Dashboard -> Theme -> Refresh