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  • John,

    Thanks for pointing me to the two functions as a starting point. I was able to put together the following, and it worked perfect. Appreciate the help.

    Code:

    function my_acf_save_post( $post_id ) {
        
    // get new value
    $costInDollars = get_field('cost_in_dollars');
    $discountInDollars = get_field('discount_in_dollars');
        
    // do something
    $totalCostInDollars = $costInDollars - $discountInDollars;
    update_field('total_cost_in_dollars', $totalCostInDollars, $post_id);
    	
    }
    
    add_action('acf/save_post', 'my_acf_save_post', 20);