Add a UTM (URL) parameter from a custom field in wordpress/woocommerce

I would like to be able to have a user click a button and append a particular field to the URL so that when they arrive elsewhere, that data can be used to track them. I have a custom field called PartnerID that was created by a plugin called WooCommerce Checkout Field Editor. I would like the button to send the following URL “” but I can’t figure out how to populate the relevant data for the PartnerID field at the end of the URL. Can you advise?