The following fields in Step 4:
Subtract Stock, Requires Shipping, Product Status are all OpenCart yes/no fields. As such importing them requires a yes/no value.
When importing these fields they always default to 'yes/enabled' or whichever setting you set up during Step 2.
If you wish to set these values on import. Make sure your Step 2 default is 'yes/enabled' and map the fields to one of the following values:
Any of the above will disabled the feature for that particular product.