Replace the wording in the pricing summary box
The pricing summary contains 3 lines: Product total, Options total, and Grand total. You may want to change the wording of these to better fit your product type. This can be done by adding the following code snippet to your theme (read here how):
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In the snippet above, you’ll see two array() statements. The first array() line contains the current wording. The 2nd array() line contains what they should become. So “Product total” becomes “New Product total”, and so on…