How do I copy customisations to another product?

To apply this to multiple products, simply return to the product list, select the desired products by checking the boxes next to them, then click on the red bulk actions button (which may be labeled as "Edit 4 Products" in this case) followed by clicking on "Update Customisations".

Select the product you wish to use as the base product to copy customisations from. This is tells the system to copy the customisations from that base product over to the selected products.

Confirm the tabs are going to copy as expected, then click Confirm to complete and copy the customisations over.