[Support request] Manually Edit Commission Amounts?

Is it possible to manually edit the commission amount for some orders?

At the moment I’ve got the commission amount set at 10% and it applies that percentage to the order. The order item contains more than one item within it, and I’d like to be able to pay commission for some items and not for others within that one ‘multi-item’. I can’t really separate the items.

I’ve seen WooCommerce Product Specific Commission, but that would only apply to the whole item and all items within it.

Thanks.