1. You cannot ADD data to a dbase table unless there is a field available to STORE that data. That is why the above comment says: "Please make sure field exists in PRODUCTS table."
2. You can add whatever FIELDS you like to the products table, and then put data into those fields - but the data that sits in these new fields is of no use to you, unless and until you incorporate it into your webshop. In other words, you will use php commands and scripts to bring that data into some useful function or operation within your store.
This will involve either editing existing PHP files so that the data can be made "useful" (perform some function), or writing new php files to do the same.
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